IRVING, Texas – Oft-injured linebacker Sean Lee of the Dallas Cowboys didn’t make it through the first offseason practice without another setback in a career filled with them.

Lee went down with a left-knee injury during the team portion of what was supposed to be a noncontact workout Tuesday. Lee got an MRI and the official diagnosis reportedly will be revealed Wednesday.

There were multiple reports Cowboys officials fear Lee has a torn knee ligament.

The fifth-year middle linebacker went to the ground with rookie offensive lineman Zack Martin from Notre Dame — a first-round draft choice — on top of him and didn’t get up right away. Lee had to be helped off the field by trainers, screaming in anger at cameramen lining the entrance to the training room.

The 27-year-old Lee has missed 15 of 32 games the past two seasons and has not played a full season in his four years in the league.

“Unfortunately, he’s had to deal with a few of these things but he’s as mentally tough an individual as I’ve ever been around,” Dallas coach Jason Garrett said.

Titans’ Locker is back on field

NASHVILLE, Tenn. – Quarterback Jake Locker is back on the field with the Tennessee Titans — a couple of weeks ahead of the schedule doctors estimated for his return from an injured right foot.

The former Washington Huskies standout said he pushed hard to give himself every chance to learn a new offense before the season starts.

“With it being a new system, I want to run plays behind center as often and as much as I can before we take our first snap of the season,” Locker said. “And I want the guys on the team to know it means something to me. I’m not just taking a break because I can. I’m going to do everything I can to be on the field, and hopefully it helps create a culture that we’re all going to work that way.”

Locker, 25, took part in his first team drills since suffering a Lisfranc injury to his right foot Nov. 10, which cost him the final seven games of the season.

Notes

• Wide receiver Malcom Floyd of the San Diego Chargers said he has been cleared to practice after missing most of last season because of a neck injury.

Floyd participated in the first day of the Chargers’ organized team activities and said, “It’s good to be back out there. I’m cleared for contact.”

• Groups who oppose the Washington Redskins’ name are taking their case directly to players.

A letter signed by dozens of Native American, civil-rights and religious organizations will be sent to every player Wednesday, asking each to add his “powerful voice to the hundreds who are already speaking out.”