Just when Browns running back Trent Richardson was moving on from his injury-plagued rookie season, he suffered another setback.

Richardson sat out the final practice of this week’s organized team activities Thursday with a strained lower-leg muscle in his shin. Coach Rob Chudzinski said Richardson, the third overall pick in last year’s draft, might miss the team’s mandatory minicamp June 4-6 because of the injury.

“It’s precautionary,” Chudzinski said. “We are holding him out. He may miss minicamp in a week and a half. I’m not sure. We’ll just take it day by day.”

Richardson missed all four preseason games last year after undergoing surgery Aug. 9 to remove a piece of loose cartilage from his left knee, which he also had scoped about six months earlier. Still, Richardson made it back in time for the regular-season opener Sept. 9 against the Philadelphia Eagles.

But in Week 6, two or three of Richardson’s ribs were broken when a Cincinnati Bengals defender rammed into him with his helmet. He was slowed by the injury for the rest of the season, but he played through it until a left high ankle sprain he suffered in Week 15 against the Denver Broncos sidelined him for the season finale against the Pittsburgh Steelers.

Richardson said he felt like a new man during minicamp April 17.

“I feel great, man, 100 percent,” said Richardson, who had 267 carries for 950 yards (3.6 average) and 11 touchdowns to go along with 51 catches for 367 yards and a touchdown last season. “I’m out there flying around. I finally feel skinny. I don’t have all this big padding on [my ribs] right now, so it’s much easier to breathe. I can sleep at night. I don’t feel anything wrong and I feel better than ever right now.”

Unfortunately for Richardson, that’s no longer the case.

Richardson did not speak to reporters Thursday. Chudzinski indicated Richardson suffered the leg injury during practice. The Browns also practiced Tuesday and Wednesday, but those sessions were not open to the media.

Richardson, though, wasn’t the only projected starter who sat out with an injury Thursday. Tight end Jordan Cameron was sidelined with a strained groin muscle.

Richardson and Cameron were on the field doing light exercises on the sidelines and watching practice. Running back Chris Ogbonnaya and tight end Gary Barnidge filled in for them most of the time with the first-team offense.