Offensive linemen Trent Williams, left, and Kory Lichtensteiger, right, at training camp Friday. (John McDonnell/The Washington Post)

Meanwhile, guard Kory Lichtensteiger had arthroscopic surgery on his right knee Monday. The coach said his ACL and MCL, which Lichtensteiger tore last season, are fine, but there were “some particles” that needed to be cleaned out of his knee.

Shanahan also said fullback Darrel Young strained his hamstring Monday, and tackle Willie Smith twisted his knee.

Lichtensteiger had some soreness and an MRI was ordered. Team doctors thought it was better to have the knee scoped now rather than wait.

He is the second starter on the offensive line to be injured in the first days of training camp. Jammal Brown aggravated a hip injury last week and is awaiting an examination by his doctor.

Shanahan said the goal is to have Lichtensteiger ready to go at the start of the regular season. Shanahan guessed that Lichtensteiger could play during the third week of the preseason, but the coach said he would rather take the cautious approach.

Shanahan said Maurice Hurt and Josh LeRibeus will split time at left guard with Lichtensteiger out.

The team also signed veteran offensive tackle Jordan Black (6-foot-5, 305 pounds) as a backup. Black went to training camp with the New Orleans Saints last season, but was released before the regular season began. He played in 15 games (including nine starts) for the Jacksonville Jaguars in 2010.

In all, Black has logged time in 80 games, with 40 starts, during his nine-year career. He started 15 games in 2006 for the Kansas City Chiefs, who had drafted him in the fifth round of the NFL Draft three years earlier.

Shanahan said he remains happy with the team’s depth on the offensive line.

Goff missed all of last season with the New York Giants after tearing the same ACL.

Shanahan said while Tanard Jackson was activated from the PUP list, running back Tristan Davis remains on the list.