Early years Plet played for SC Voorland,
Ajax,
Haarlem and
Argon, before joining
FC Den Bosch in 2005. Plet had a tumultuous career early on: "Throughout my entire youth, I went back and forth between professional and amateur clubs. Starting with the youth team of Ajax, then to amateur clubs in Haarlem, and again to amateurs in Den Bosch. I was too impatient and I had to get playing time at all costs." During his time in the youth team of Haarlem, which was a professional club at the time, Plet spent four years there. However, at the age of 16, he made the unconventional decision to join the under-19 team of
Hoofdklasse amateur club Argon. Initially, he had no interest in this move as his lifelong goal had always been to become a professional footballer, and transitioning from a professional club to an amateur one seemed counterintuitive. Nevertheless, his father and brother believed that Argon would provide better opportunities for him to showcase his talent. Haarlem never attracted any scouts, whereas Argon's under-19 team competed at a higher level against clubs like Ajax,
Zwolle, and
Emmen. Plet's father persisted, urging him to "listen to me for a year, give your all to football, and you'll see that it will work out."
Den Bosch Taking his father's advice to heart, Plet gave his utmost dedication that season, and, after a year, he earned a move to professional club
FC Den Bosch. On 6 April 2007, he scored his first professional goal, shortly after coming off the bench, in another away loss to Stormvogels Telstar. However, due to the presence of fellow
striker Frank Demouge, Plet was primarily limited to substitute appearances. Following Demouge's departure to
Willem II, head coach
Theo Bos chose
Koen van der Biezen as the team's first-choice striker. Despite gaining first-team experience, Plet departed the club after consultation with his father and agent, due to the fact that he was on an amateur contract and in need for financial independence. In the
2007–08 season, Plet joined amateur club
Lisse in the
Saturday Hoofdklasse A. Plet took on a daytime job with a sponsor while practicing in the evenings. Reflecting on that period, the striker acknowledged its positive impact, stating, "That year was good for me. I earned my own money, which boosted my self-worth." He scored on his debut for the club on 8 August 2008, the first matchday of the
season, securing a 1–0 away victory against
Excelsior. In the
2009–10 season, Plet was one of the revelations in the Eerste Divisie. Partly because of the many goals he made for the club, Telstar won the period title for the first time since 1979. In his two seasons in the Eerste Divisie, he had scored 18 and 21 goals respectively – the latter being a club record. Plet scored two goals for Heracles on his Eredivisie debut against
Willem II in a 3–0 home victory on 7 August 2010. He scored a total of seven goals in 22 matches in his first season for the club, before adding 10 goals in 19 matches in the
2011–12 season. He was supposed to succeed
Marc Janko as the competitor of
Luuk de Jong. He made his debut for the club against his former club, Heracles, on 10 February 2012. However, he failed to meet expectations at Twente and was told he could leave the club in the summer of 2012, scoring six goals in 22 appearances during his time there. At Genk, Plet took on the role of a supersub, starting only eight out of 27 league matches, but still managing to score ten league goals. During that season, Plet also achieved success with Genk by winning the
Belgian Cup. The team secured victories over notable opponents such as
Standard Liège,
Zulte Waregem, and
Anderlecht. In the first cup round against
third division team
Union SG, Plet contributed to the 6–0 victory by scoring a header to double the score. However, he did not find the net again throughout the cup campaign. In his final appearance for Genk, Plet reached a significant milestone by scoring his 100th career goal. He netted the 1–1 equaliser against
Sporting Lokeren, and also provided the assist for the winning goal, proving himself decisive in the 2–1 victory. After discussions between Genk and Twente, it was decided that Plet, despite his total tally of 13 goals, would return to Twente. His contract was terminated by Twente on 1 September.
Hapoel Be'er Sheva Plet signed a two-year contract with
Israeli Premier League club
Hapoel Be'er Sheva on 23 September 2013. On 9 February 2014, Plet scored the equalising goal in the 34th minute, a strike from distance, in a 3–1 loss to
Maccabi Tel Aviv. In May 2014, his strike was chosen as Goal of the Year by the Israeli
television channel,
Channel 1. With Hapoel Be'er Sheva, Plet secured a spot in the UEFA Europa League by finishing in second place in the league.
Zulte Waregem On 9 July 2014, Plet returned to Belgium by signing with
Zulte Waregem, having previously enjoyed considerable success with Genk. In the return leg, he scored again, contributing to a 3–1 victory. Plet's first appearance in the league for Zulte Waregem occurred on 27 July, in a home match against
Kortrijk, which ended in a 2–0 win for Waregem. On 10 August 2014, Plet scored his first league goal for
Essevee in a 1–1 draw against
Club Brugge, finishing off a cross from
Aleksandar Trajkovski. However, Zulte Waregem had a challenging start to the season, resulting in the team's decline to lower positions in the league standings. During this period, Plet managed to score only one additional league goal, leading coach
Francky Dury to relegate him to the bench. In January 2015, Plet was informed that he was free to explore opportunities with other clubs. He scored twice in 18 appearances for Zulte Waregem.
Go Ahead Eagles (loan) On 29 January 2015, Plet was sent on loan to
Eredivisie side
Go Ahead Eagles for the rest of the season. He suffered relegation to the Eerste Divisie with the club at the end of the
season. He managed to score only once during his time at Go Ahead, in a 2–1 away loss to
Dordrecht.
Maccabi Haifa On 7 September 2015, Plet returned to Israel and signed a two-year contract with
Maccabi Haifa. On 12 September, he made his debut against
Bnei Sakhnin, coming on as a substitute for
Ofir Kriaf in the 69th minute. However, he was
sent off in injury time after
elbowing opposing centre-back
Abraham Paz in the back of the head. As a result, he received a three-game suspension by the
Israel Football Association's tribunal. On 24 October, he made his second appearance for the team and scored his first goal in a 4–0 victory against
Hapoel Acre. On 4 January 2016, he scored in a match against his former side, Hapoel Be'er Sheva, but later on also received a red card for the second time that season, after a foul on opposing goalkeeper
Dudu Goresh. During the
Israel State Cup semi-final, also against Hapoel Be'er Sheva, he scored a
brace within two minutes, but later fell out due to an injury, as his team eventually won 3–1. Maccabi Haifa progressed and won the cup after a 1–0 victory over
Maccabi Tel Aviv in the final. Plet played one and a half years for Maccabi Haifa, scoring 12 goals and assisting four in 33 appearances for
the Greens.
Alanyaspor On 10 January 2017, Plet signed with Turkish
Süper Lig club
Alanyaspor on a two-and-a-half-year deal. As a result, Plet played his final competitive match for Alanyaspor on 22 May 2017. He decided to stay and honour his contract despite the club wanting to ship him elsewhere. Plet appeared for training every day, despite being only rarely selected to play. New Telstar head coach
Andries Jonker was pleased with Plet's return to the club: "With Glynor, we are bringing in a player with a lot of experience and quality. In a young group, it is important to have guys like Glynor who know what it takes to live as a professional footballer. The qualities that Glynor brings with him make us as staff confident in his added value, and I am very happy that we have been able to secure Glynor for two seasons." On 13 May 2023, Plet became Telstar's
all-time leading goalscorer, scoring in a 2–1 league loss to
MVV, after having shortly shared the title with
Sander Oostrom. At that point, he had decided not to renew his contract with Telstar, despite the club expressing their hope of signing the 36-year-old Plet to a
new deal. He left Telstar at the end of his contract in June 2023, still undecided on whether he would continue or retire. In July 2023, he had decided not to rejoin Telstar, expressing a desire to pursue a career as a
sports agent while continuing to play, preferably for another professional club. On 24 May 2024, Plet and
Frank Korpershoek played a
testimonial match to raise funds for Spieren voor Spieren, a charity dedicated to financing research into
neuromuscular diseases. Plet scored a hat-trick in a 6–2 win, with former teammates and coaches paying tribute to him. ==Style of play==