D.J. Hayden was released from the hospital on Wednesday following surgery to remove scar tissue as a result of last November's heart surgery.

Hayden underwent emergency surgery due to a severe injury to his heart.

Hayden's doctor has stated this scar tissue is not a lingering issue of the injury but rather a result of the surgery and is rather common. 

Hayden was the 12th overall pick in the 2013 NFL Draft by the Oakland Raiders.

Adrian Peterson practiced on Wednesday just three months after undergoing surgery for a sports hernia.

Peterson feels as though he is close to 100 percent.

"You know, me knowing my body I'd like to be a little stronger in some areas. But I'm feeling great," he told reporters.

Peterson said returning from the sports hernia surgery is much easier than trying to come back from major knee surgery, although he "earned a lot more respect for [his] abdominal muscles."

"It was a cakewalk compared to recovering from the ACL and what I had to go through to bounce back from that," he said.

Arian Foster will miss the remainder of the Houston Texans' OTAs and the team's minicamp due to a strained right calf.

Foster was on crutches on Wednesday, one day after he suffered the injury on the first play of team drills.

"He'll stay on crutches a couple of days, rehab, and we'll have him back for camp. He's going to be fine," Gary Kubiak told reporters on Wednesday.

Ben Tate will receive most of the reps in Foster's absence.

Rob Gronkowski will need back surgery, which was expected and tentatively is planned for mid-June.

Gronkowski's arm, however, is healing with no sign of the infection resurfacing.

Dexter McCluster injured his hamstring during the Kansas City Chiefs' OTA on Thursday.

Andy Reid said after the week's final organized team activity that McCluster had a "mild" hamstring injury. 

Trent Richardson sat out organized team activities on Thursday with the Cleveland Browns due to a pulled muscle in his shin.

Richardson may miss the Browns' mandatory minicamp June 4-6.

"It's precautionary," Rob Chudzinski said. "We're holding him out. We've got minicamp in a week and a half. He may miss that. I'm not sure. We'll take it day-by-day.''

Richardson battled through injuries in his rookie season, leading the Browns to be cautious with him now.

Robert Griffin III was not a participant in the Washington Redskins' OTAs on Thursday, but was making throws on the field as he rehabs from knee surgery.

Griffin dropped back to throw passes to Pierre Garcon and Fred Davis, amongst other receivers.

Griffin was able to plant on his right leg even though it was far from full speed.

Griffin wore a brace on his right knee.

Michael Crabtree suffered a torn Achilles tendon during Tuesday's OTAs and could need season-ending surgery.

Crabtree had a breakout season in 2012, catching 85 balls for 1,105 yards and nine touchdowns.

Crabtree also had 20 catches for 285 yards and three touchdowns in the postseason.

ESPN's Chris Mortensen reports that Crabtree has already undergone surgery.

Rob Gronkowski underwent a fourth surgery on his forearm on Monday.

A source says doctors believe the previous infection in Gronkowski's arm is now gone.

Doctors put new plates in to repair the previously broken left forearam.

The estimated timetable for recovery is around 10 weeks, assuming there are no setbacks.

Gronkowski will be evaluated in three to four weeks to determine whether he also needs back surgery.

Tony Romo underwent a minor surgery on his back in April to remove a cyst.

Romo will miss the Dallas Cowboys' OTAs that begin Tuesday and last three weeks.

The team's minicamp will be held June 11-13, which Romo may also miss.

Romo expects to be ready for training camp in July.

"If this was the regular season and I had to play next week, I could,'' Romo said. "This is just about being smart. That's why I did it now. This will have no effect on training camp. No way will it have an impact. And I still think there's a good chance I'm on the field for minicamp.''