Suwon KT Sonicboom (2023–2024) Before Ildefonso played his final year with Ateneo, he was contacted by teams from the
B.League and
Korean Basketball League to play overseas, but he declined any interest of playing for them at the time. He was ready the following year, however, as Ildefonso entered the professional level with the KBL's
Suwon KT Sonicboom in 2023. He was later replaced by Filipino-Italian
Dalph Panopio as the team's Asian import.
Contract issues with NorthPort Batang Pier (2024) On July 2, 2024, Ildefonso declared for the
PBA season 49 draft, where he would go on to be selected by the
NorthPort Batang Pier with the fifth pick. Despite optimism between both Ildefonso and NorthPort, they weren't able to agree to a deal, despite being initially offered a two-year max contract by the team. NorthPort head coach
Bonnie Tan also denied of the possibility of the team trading him out. Danny I, who became an assistant coach for the
Converge FiberXers, commented on a Facebook discussion regarding his son's contract situation, specifically mentioning "
farm team" in his comments. The older Ildefonso would later be fined ₱20,000 by commissioner
Willie Marcial.
Abra Solid North Weavers (2025–present) Ildefonso's fallout with NorthPort meant that he was left unsigned, and on February 7, 2025, he signed a deal with the
Abra Weavers of the
Maharlika Pilipinas Basketball League, with his contract reported to be worth ₱420,000 per month for three years. Dave, in an interview with SPIN.ph, stated that he still wanted to play in the PBA, hoping that he can settle on a deal with NorthPort after his MPBL stint due to the team still having his PBA rights. Ildefonso made his debut for Abra on March 9, 2025, the opening day of the 2025 MPBL season. On October 24, his PBA signing rights (now held by NorthPort's successor,
Titan Ultra Giant Risers) were traded to the
Converge FiberXers in exchange for
Kobe Monje and Converge's second-round pick in season 51 and first-round pick in season 52. == Personal life ==