"I have spoken with my family and coaches about my situation, and I feel that it's best for me to forgo my senior season and enter the NBA Draft," Thompkins, 6-foot-10, 245-pounds, said in a news release. "I would just like to thank everyone who has supported me in this decision."
"We certainly appreciate Trey's contributions to the program and we wish him well in the pursuit of his dreams," coach Mark Fox said.
While Thompkins plans to hire an agent, ending any chance he could return, teammate Travis Leslie plans to test his draft status.
But he will not hire an agent. The deadline for underclassmen to withdraw their names from the draft to preserve eligibility is May 8.
"Travis has exercised his right to 'test the waters' as a junior," Fox said. "We will help him manage that process in a timely manner."
Leslie averaged 14.4 points and 7.2 rebounds a game last season. Should Leslie return for his senior season, Fox said he would be a key for the team's success.
"It obviously will impact—because he's a great player—how we're going to play…in the mean time we're in a holding pattern," Fox said.