The Ravens guard position, fortified by star veterans and promising young linemen, was a bit thin Thursday with starter Kelechi Osemele sitting out and reserves John Urschel and Robert Myers leaving practice early.
Osemele had his foot stepped on early in Wednesday's practice during a run-game drill involving the full offensive and defensive lines. He continued to play every snap the first-team offense did, though he was clearly favoring the ankle in between reps.
Coach John Harbaugh said he decided to hold Osemele out Thursday because of the physicality of a practice built around short-yardage situations.
In his place stepped second-year guard John Urschel, who hit his head early in practice Thursday. He laid on the field for several minutes while being tended to by trainers, and a cart came out to take him inside the team facility, but Urschel was able to walk off the field.
Rookie Robert Myers, who was selected in the fifth round of the NFL draft and is expected to add to the team's depth, also banged his head in practice, Harbaugh said.
Harbaugh said both Urschel and Myers were being examined for a concussion.
The shuffling meant third-year guard-center Ryan Jensen came in with the first-team offense for the first time this camp. When Osemele and right guard Marshal Yanda got a day off on Sunday, Myers and Urschel spelled them. Jensen has been working as the second-team center.
"It's unfortunate what happened today, but that's kind of what happens in this league," Jensen said after practice. "You've got to be able to step up when your number is called, and I think today was a good opportunity to show that I can play guard and center. I've been mostly playing center all camp, and it was an opportunity for me to show that I can be versatile and play both positions."
The shuffle is somewhat familiar for Jensen, who worked at center as a rookie and competed with Rick Wagner to be the starting right tackle entering 2014. He shifted to guard and ended up on the practice squad for all but the final month of 2014 before reverting back to center for 2015.
"Being able to go out and run with the first-team offense today and get that experience with Eugene [Monroe] and Marshal [Yanda] and all them and being in a group with them, it was a good opportunity for me," Jensen said.