Samuels was injured in Sunday night's 24-10 loss to the Baltimore Ravens.
Right tackle Jon Jansen was also hurt in the game was having an MRI on Monday on his left knee. The dual injuries forced coach Jim Zorn to insert Justin Geisinger -- a backup center who hasn't played tackle since college -- into the game at tackle in the fourth against the stifling Ravens pass rush.
Geisinger struggled -- and got hurt as well. He was having an MRI on Monday to address what Zorn called "a potential knee problem."
Second-year player Stephon Heyer will start the rest of the season at left tackle in place of Samuels, Zorn said, with journeyman Jason Fabini getting first shot at right tackle if Jansen is unable to play. At the very least, the Redskins plan to promote tackle Devin Clark from the practice squad and sign another offensive lineman to the practice squad.
Zorn shuffled his hands back and forth as he discussed the various permutations.
"It's a lot to deal with over the next three or four days," the coach said.
The Redskins (7-6) have lost four of five and are in an offensive free-fall, scoring only 33 points in the four losses. They rank 29th in scoring.
Two defensive players were also having injuries checked out Monday. Rookie safety Chris Horton was having an MRI for a possible labrum tear in his shoulder, and defensive tackle Cornelius Griffin was suffering from an abdominal strain and was being examined for a possible hernia.
Samuels, who has been to three straight Pro Bowls, has been bothered by a sore knee for much of the season. The knee caused him to sit out the win over Detroit last month, the first game he has missed since 2003.
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