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(Updated at 5:34 p.m.)

CHAMPAIGN - After a season of mostly good health, the Illini hit a rough patch this offseason.

The latest bugaboo is a knee injury to freshman Joseph Bertrand. Coach Bruce Weber said this afternoon Bertrand aggravated a knee injury during a workout Monday night at the team's practice facility.

The UI announced later today that Bertrand will undergo arthroscopic surgery Friday. A timetable for his return will be determined after the operation. Before it was confirmed Bertrand will need surgery, Weber had estimated the freshman could be sidelined anywhere from 2-to-6 weeks.

Bertrand was bothered by the knee earlier in the summer. The 6-foot-5 guard had been performing well in workouts and often was a bright spot in summer pickup games.

"He's very talented. He's very long. The strength is a factor a little bit and some footwork things," Weber said. "But I think Joseph has shown that he's as talented as some of those other guys."

UI forward Mike Davis sustained a broken ankle in June but has fully recovered. He has participated in all of the team's four-man workouts.

"I don't even notice anything (has dropped off with Davis)," Weber said.