Mike Tyson's planned comeback is on hold once again.

Nevada boxing authorities postponed a licensing hearing scheduled on Saturday for the former heavyweight champion, after psychological tests took longer than expected and were not forwarded to boxing commissioners in time.A date for the new hearing probably won't be determined until Thursday, said Marc Ratner, executive director of the Nevada Athletic Commission.

"It's a matter of our doctors being able to read the reports and then getting all the commissioners together at one time," Ratner said. "I'll eventually come up with a date."

Tyson's doctors were to have the reports given to the commission by 5 p.m. Monday. But shortly after that time, the commission got a fax saying the reports were not completed and likely wouldn't be ready until Wednesday.

Commissioner James Nave said that didn't give the commission enough time to go over the five days of tests performed on Tyson at Massachusetts General Hospital. The tests began Sept. 23.

"We want enough time to do our homework," Nave said.

The delay in the commission hearing could threaten plans by Tyson's advisers for the former champion to fight a comeback bout before the end of the year. Though Tyson has been training lightly, it would probably take more than two months to train properly for and promote the fight.

Dr. Ronald Schouten, head of the team that examined Tyson, sent a letter to commission chairman Dr. Elias Ghanem, saying the reports would be completed Wednesday.