FLORHAM PARK, N. J. — New York Jets General Manager Mike Tannenbaum admitted Thursday the team should have disclosed Brett Favre’s torn biceps tendon on mandatory weekly injury reports over the final third of last season.

Favre, now with the Minnesota Vikings, said earlier this week he thought he was hurting the Jets because of the injury and discussed it with the coaches and the front office. He said he would have been willing to sit out, even though that would have ended his streak of consecutive starts, which now stands at 269 games.

Tannenbaum said he should have listed the quarterback as “probable,” but didn’t because the injury was not severe enough to require daily treatment and there was never any doubt Favre would play.

NFL spokesman Greg Aiello said the league was investigating.

“We have just started looking into it,” he said. “No determinations have been made regarding discipline.”

In the past, such violations usually have resulted in fines.

Hiding injuries could affect an opponent’s preparation and the NFL has stepped up policing such practices.

“As the GM of this team, I should’ve handled that differently and listed him on the report,” Tannenbaum said. “We didn’t, just because he wasn’t getting treatment every day and we knew he was going to play. But, looking back on it now, I should’ve listed him as probable, and we didn’t, and I’ll take responsibility for that.”

He said he has spoken to Ray Anderson, the NFL’s executive vice president of football operations.

“I’ll just say that we’ll cooperate with them,” Tannenbaum said, “and we’ll go from there.”