San Beda Red Lions In 2018, Nelle stayed with the San Beda program, and joined the
San Beda Red Lions. He joined a recruiting class that also included
James Kwekuteye and
Damie Cuntapay. In his rookie season, although he had little playing time, he served as
Robert Bolick's backup, and was part of the San Beda squad that won the
NCAA Season 94 title.
Season 95: Breakout season In the preseason before
Season 95, Nelle and Kwekuteye helped San Beda win the 2019 Filoil Flying V Preseason Cup, finishing the tournament undefeated. The duo, along with teammate Donald Tankoua, were named to the Mythical Team. During the tournament, the duo was referred to as the "Bandana Bros" due to the bandanas they started wearing. Nelle started San Beda's title defense with a win over the
Arellano Chiefs in which he had nine points, five rebounds, and five assists. He then put up a career-high 14 assists in a win over the
JRU Heavy Bombers, the most in the league since
Jio Jalalon have 16 assists in 2015. The following game, he scored a then college career-high 15 points and added seven assists in a win over the
EAC Generals, while Kwekuteye had a season-high 21 points in that win. He then had a double-double of 14 points and a career-high 14 rebounds in a win over the
San Sebastian Stags. He broke his career-high with 18 points, seven rebounds, and three assists in a win over the
Letran Knights, although he did have eight turnovers, got into foul trouble and missed clutch free throws that almost gave Letran the win. In San Beda's sixth straight win of the season, he scored 12 points and four assists against the
Perpetual Altas. In San Beda's seventh straight win, he scored nine of his 14 points in the fourth, along with seven assists and four rebounds to prevent the
Lyceum Pirates from breaking the streak. San Beda then won their 10th straight game of the season against EAC in which he had a double-double of 14 points and 11 assists. They extended the streak in a win over the
Mapúa Cardinals in which he and Kwekuteye combined for 30 points. They kept winning until the end of the eliminations, completing 18 games without a loss. By that point, he led the league in assists with 6.7 per game, and also averaged 10.2 points, 4.5 rebounds, and 1.6 steals. With the championship on the line in Game 3, he exchanged clutch shots with Letran's
Fran Yu, including a three-pointer that brought San Beda to within two points with 11.5 seconds remaining. San Beda then forced a jump ball, giving him another shot to win the game. However, his three pointer was blocked, and Letran won the championship. In 2020, Nelle decided to transfer. He also revealed that the coaching staff also didn't contact him for a month, and that he had also gotten into an argument with the team manager when practices resumed. In his time at San Beda, he averaged 10.5 points, 4.6 rebounds, 6.3 assists, and 1.4 steals in 31.5 minutes of playing time.
De La Salle Green Archers On January 21, 2020, Nelle confirmed that he was going to transfer to the
DLSU Green Archers of the
UAAP.
Mark Nonoy, a UAAP Rookie of the Year winner from the
UST Growling Tigers, joined him to form a new backcourt tandem. Both were eligible to play beginning in
UAAP Season 84.
UAAP Season 84: First Final Four appearance In his UAAP debut, Nelle had 11 points and three assists in a win over the
UE Red Warriors. They lost their first game of Season 84 against the
Ateneo Blue Eagles in which he had 10 points, two boards, and two assists, but was a minus-15 on the court. He then had 13 points in a loss to the
UP Fighting Maroons. In his first six games with the Green Archers, he struggled with averages of 7.8 points on 23% shooting from threes, to go with 2.8 assists, 1.8 rebounds, and 1.5 steals. Against the
Adamson Soaring Falcons, he made a clutch three-pointer that helped La Salle seal the win. In a rematch against Ateneo, he scored 20 points, but Ateneo won once again. In a rematch against UE, he contributed 16 points, and six assists as they won by 29 points. Then they lost to UP once again in which he and Nonoy combined to shoot 5-of-19 from the field and had four of the team's 12 turnovers. In a loss to the
FEU Tamaraws, he led with 15 points on four three-pointers along with seven rebounds and five assists. La Salle was able to get back into the Final Four after five seasons with a win over Adamson in which he produced 11 points, five rebounds, two assists, and two steals while limiting Adamson's main scorer
Jerom Lastimosa to just 11 points. Entering as the third seed against UP, he led La Salle to a Game One win with a UAAP career-high 26 points on five triples and clutch free throws, plus seven rebounds, six assists, and three steals. However, he struggled the following game with six points on 2-of-12 shooting from the field, four rebounds, four steals and three assists. He still had a chance to tie the game with 21.5 seconds remaining, but he missed his floater and UP went on to the Finals.
UAAP Season 85: Missing out on the Final Four In the offseason, Nelle was originally gonna miss DLSU's inaugural campaign in the 2022 PBA D-League Aspirants' Cup for personal reasons. However, he was able to make his return to the team in a win over FEU. He also got to faceoff against former teammate James Kwekuteye in a win over San Beda.
Season 85 saw DLSU bolstered by the addition of
Kevin Quiambao, who had led them in their PBA D-League title campaign. Nelle missed a game in the first weeks of the elimination rounds due to a fever. He made his return with 10 points in a win over Ateneo. However, he missed another game, this time with Mark Nonoy also joining him on the sidelines. Nelle returned with an all-around eight points, 12 assists, six rebounds, and six steals in a win over FEU. Against Adamson, he had a near triple-double of nine points, eight boards, and nine assists, but got his third unsportsmanlike foul of the season and missed a game-winning layup in double OT. With his third unsportsmanlike foul, he was suspended for one game. La Salle got its fourth straight loss of the season against Ateneo as he was the only one in double-figures in that game with 15 points. They bounced back with a comeback win over UP, with him contributing nine points and seven assists. He then scored eight of his 10 points in the fourth quarter of a win over the
NU Bulldogs that evened their record to 6–6. They closed out the elimination rounds 7–7 with a win over UST in which he scored a season-high 25 points along with four rebounds and four assists. In their playoff game against Adamson for the last spot in the Final Four, Nelle battled Jerom Lastimosa, with Nelle scoring most of his points in the first half to give La Salle the lead, then Lastimosa going on a personal 11–0 run to bring the momentum back to Adamson. Adamson eventually took a three-point lead into the final seconds of the game, but Nelle made a clutch lay-up with 15.4 seconds remaining. After Lastimosa made two free throws, he had a chance to tie the game, but he rushed his three-pointer and the ball hit the side of the backboard. With that, La Salle missed out on the Final Four once again. He also had averages of 11.1 points, 4.9 rebounds, and 1.7 steals in 28.1 minutes. Although he finished in the top 5 in statistical points and could have made the Mythical Team, he was disqualified due to his one-game suspension. His teammate Quiambao though, won Rookie of the Year.
UAAP Season 86: Championship season After La Salle announced that they would have a new head coach with
Topex Robinson replacing
Derrick Pumaren, Nelle decided to stay for his final season. In the preseason, he led them to the
2023 Filoil EcoOil Preseason Cup finals, where they lost to UP. He and Quiambao made the tournament's Mythical Team. He also led them to another PBA D-League title despite getting injured with 16 points, 5 rebounds, 7 assists, and 6 steals in the championship game against his former team San Beda. Nelle started
Season 86 with 15 points, 12 assists and eight rebounds in a win over FEU. He got 15 points again against Ateneo, but shot 4-of-16 from the field as they got their first loss of the season. Against Adamson he scored six of his 12 points in a 23–0 third quarter run that led to the Archers' third win of the season and the second seed. Aside from his 12 points, he also contributed 15 rebounds and five assists. He missed a game that season due to a quad contusion. He quickly made his return in a win over UE with 14 points, four rebounds, and four assists but also committed six turnovers. In a win over UST, he had a double-double of 11 points and 10 assists alongside his four steals. In a win over NU, he had 14 points and seven assists, while Quiambao got a triple-double with 17 points, 14 assists, and 11 rebounds. Against UP, he made a clutch triple that sealed the win and finished with 17 points, six rebounds, and four assists. Although he struggled in a rematch with UE, his teammates Quiambao and Nonoy stepped up as the former grabbed his 2nd triple-double of the season while the latter scored a season-high 25 points to win their sixth straight game. They closed out the elimination rounds on an eight-game winning streak with a win over Ateneo in which he made two clutch free throws. As he averaged 11.3 points, 6.9 assists, 5.0 rebounds, and 2.0 steals, he was awarded a spot on the UAAP's Mythical Team alongside Quiambao, who won MVP. In Game 1 of the Finals against UP, they lost by 30 points as he was held to eight points. He shot a poor 2-of-12 from the field for just four points in Game 2, but still made an impact with 12 rebounds, 10 assists while also getting five steals and was also a plus-20 on the court as DLSU bounced back. In Game 3, he made a deep three-pointer in the last six minutes of the game to cut UP's lead to one before Quiambao took over to get DLSU a lead they never gave up. He finished with 12 points, seven assists, six rebounds, and two steals as he finally won a championship with DLSU. == Professional career ==