Ameer Abdullah underwent surgery to repair a torn labrum in his shoulder in January.

The Detroit Lions expect him back by the start of training camp.

Jim Caldwell confirmed Abdullah had surgery but declined to give specifics, including whether Abdullah was playing with the injury the entire season.

He also said "we'll see" when he expects Abdullah to return.

"He's recovering nicely," Caldwell said.

Abdullah was a second round pick in 2015 and led the Lions in rushing yards with 597.

Sammy Watkins had surgery three weeks ago on a broken foot.

Watkins led the Buffalo Bills in receiver yards (1,047) and touchdowns (nine) last season, his second in the NFL.

Watkins had a screw inserted in his foot to repair the injury.

Melvin Gordon underwent microfracture knee surgery this offseason in January.

Gordon had a disappointing rookie season with the San Diego Chargers.

Gordon's timetable for recovery is four to six months.

Gordon suffered the cartilage tear in his left knee that required surgery during a Dec. 20 game against the Dolphins.

"I'm getting better. I'm getting better," Gordon said. "I'm not where I want to be, but I think I'm ahead of schedule. I'm sprinting pretty well. I'm cutting."

Dez Bryant has made progress in returning from ankle surgery.

Bryant missed seven games in 2015 with various injuries including a broken foot.

Jason Garrett said Bryant is on track in rehab.

"He's done a really good job with his rehab and he's made progress," Garrett said, via the team's official website. "Like with all those guys, it's a day-by-day, week-by-week thing. But he's had no setbacks, but he really continues to get better and better."

The Dallas Cowboys will likely ease Bryant back into workouts.

"He's not 100 percent, like, full-speed - what do you call it? Released, cleared to go," receivers coach Derek Dooley said. "That doesn't mean he can't, but I think June 1."

Adrian Peterson would like to play in the preseason, something he hasn't done since 2011.

"I feel like getting out there and playing a little bit," Peterson said in a phone interview with the St. Paul Pioneer Press. "It's something that once that time comes around, I'll have a better feel for, like, 'Hey, I need to get out there just to kind of get the legs moving and get the pads (on) a little bit.' I can tell you, though, I'm definitely more itching towards playing a little more in the preseason than I have the past seven, eight years."

Peterson tore his ACL in December of 2011 and the Minnesota Vikings have been extremely cautious with him ever since.