Tight end Chris Cooley will miss at least the next couple of weeks with a sore knee, Redskins Coach Mike Shanahan said Friday night.

“Keep our fingers crossed that he’ll be back. When it will be, I can’t tell you for sure,” Shanahan said.

Cooley has missed some practices because of a sore left knee. He had arthroscopic surgery on the knee following last season but has experienced swelling and irritation that has kept him off the field.

He missed Friday’s 16-7 win over the Pittsburgh Steelers, and Fred Davis started in his place.

As for when Cooley will return, “We’ll just have to wait and see,” Shanahan said.

After sitting out the morning practice Wednesday, Cooley was not at Redskins Park for the team’s afternoon walk-through. Shanahan said Cooley was seeing a knee specialist at the time. An MRI didn’t reveal anything alarming, the coach said, but Cooley is still too sore to return to action.

“He’s had it drained a few times. That’s not good,” Shanahan said. “He’s a tough player and he wants to get back quick. We have to give him a little break and hopefully we’ll get the knee responding.”