Browns inside linebacker D'Qwell Jackson underwent pectoral surgery Wednesday at the Hospital for Special Surgery in New York, his agent Brian Mackler said.
Jackson was placed on injured reserve Tuesday, ending his season. He was hurt late in the second quarter of Sunday's loss at Pittsburgh. He's led the Browns in tackles each of the past two seasons and was second as a rookie in 2006.
Mackler said the injury was not as serious as it could have been.
''He'll be back to being the NFL's leading tackler in 12 weeks,'' Mackler said.
Mackler said he represents over 90 athletes and he's never heard such heart-felt wishes to pass along from media members who called about Jackson the past few days.
''He's a special kid,'' Mackler said.
Mackler said he was not worried that the injury would affect Jackson's chances of receiving a new contract from the Browns. Jackson is in the final year of his deal that pays him $640,000 this season.