Illinois looked like it had its roster set. It was returning most of its core from a Final Four team and adding a handful of major players out of the transfer portal. For the most part, its offseason was complete – and still could be – but a wrench was thrown in the middle of those plans on Sunday. Star wing Andrej Stojakovic, the son of three-time NBA All-Star Peja Stojakovic, entered his name into the NBA Draft ahead of the deadline on Friday as he will go through the process despite announcing his return to the program earlier in the month. The news was reported by ESPN. Stojakovic averaged 13.5 points and 4.5 rebounds per game this season for the Illini after spending the first two seasons of his career at Stanford and California. The 6-foot-7 product was on the extreme outskirts of the NBA Draft, ranking No. 94 in ESPN’s ‘Best Available’ list and not being on its updated Top 100 Big Board.…