Browns cornerback Joe Haden has a sprained knee and "may miss some time," coach Pat Shurmur said Monday.
Haden is one of the players the Browns could least afford to lose for a significant time because he's the best player on the defense and perhaps the team. He is regularly assigned to shut down the other team's No. 1 wide receiver.
The 2010 first-round pick will have an extra week to rest because the Browns are on their bye week. Cleveland plays at Oakland on Oct. 16.
An MRI on Monday revealed the sprain, but he won't need surgery. Haden wore a brace to team meetings.
"We'll just have to see as we move forward how significant it is," Shurmur said at his Monday news conference. "At this point, I don't know anything."
If Haden is sidelined, the Browns would likely start Dimitri Patterson, who has been solid as the team's nickelback. Haden has been one of the top cornerbacks in the NFL this season, quieting the likes of A.J. Green, Reggie Wayne and Brandon Marshall.