The New York Jets' safety, the team's first-round draft pick in May, was being evaluated for a concussion after injuring his head early during special teams drills Saturday.
Coach Rex Ryan said Pryor was hurt when he collided with a teammate while serving as a punt protector.
''As of right now, we don't know if it was a concussion or not,'' Ryan said. ''It was a head injury, and when those things happen, you're always going to side on being cautious. So that's what we're doing.''
Pryor jogged off the field with a trainer after the play and remained on the sideline wearing a cap and no jersey for most of the rest of practice.
The injury came on the first day the Jets wore pads and held a full-contact practice since training camp began Thursday.
''He came in there and had a good collision, so it's not like you can say he got dinged or whatever,'' Ryan said. ''But `dinged' now means you be cautious and do what's in the best interest of the young man. That's where we're at.''
Pryor, the No. 18 selection out of Louisville, is a likely starter for the Jets opposite either Dawan Landry or Antonio Allen. Nicknamed the ''Louisville Slugger'' in college for his hard-hitting style of play, Pryor has often been referred to by Ryan as ''an enforcer'' type of player.
Meanwhile, running back Chris Johnson and linebacker Garrett McIntyre were limited on ''pitch counts'' as both are coming off offseason knee surgeries. Guard Willie Colon and linebacker Antwan Barnes - both sidelined with knee injuries - remained on the active/physically unable to perform list. Ryan said Colon is ''real close'' to returning.