An MRI conducted on tackle Trent Williams’ right knee revealed that he has a bone bruise, and not a season-threatening injury, according to a source familiar with the results of the test.  It’s not yet known how much time Williams will miss.

 Williams, charged with protecting quarterback Robert Griffin III’s blind side, injured his knee on the second play of Sunday’s game, returned briefly in the second quarter and played three snaps in the third quarter before leaving the game for good.

 He had an MRI conducted on his knee Monday morning.

Trent Williams suffered a bone bruise in his right knee on the second offensive play of the game. (John McDonnell/The Washington Post)

 “He should be OK,” said the source, who spoke on the condition of anonymity because he wasn’t authorized to speak for the Redskins. “Not serious. He has a bone bruise.”

 Williams was at Redskins Park Monday. He moved with a limp and wore a light weight brace on his knee.

 He briefly stuck his head in the locker room during the media availability session but turned and went to the trainer’s room instead. A short time later, Williams was sitting in a hallway with teammates where reporters aren’t allowed to conduct interviews.

 Asked how he was feeling, Williams nodded and said only, “I’m good.”

 A Redskins spokesman said that coach Mike Shanahan would address Williams’ status during his regular Monday afternoon news conference.

 Williams, a fourth overall draft pick out of Oklahoma who is in his third season with the Redskins, has missed two games in each of the last two seasons with knee injuries, but neither required surgery. He also missed the final four games of last season when he was suspended for substance abuse.

 Backup tackle Jordan Black, who took over for Williams in Sunday’s game, said he didn’t yet know what kind of a workload he would receive this week, but would prepare as if he were starting.

 “Getting a week of practice preparing for an opponent will be a help,” said Black, who signed with the Redskins in July and was out of football last season. “It’s my job to go in there and play, and so that’s what I’m going to do.”