Here is a release from the team:
Seattle Seahawks defensive end Patrick Kerney and guard Mike Wahle have undergone successful shoulder surgeries performed yesterday, the team announced this morning. The team also signed center Donovan Raiola to the practice squad, replacing guard Pat Murray, who signed to the Denver Broncos 53-man active roster yesterday.
Kerney underwent arthroscopic surgery on his left shoulder and is expected to be sidelined until training camp in 2009.
Wahle underwent arthroscopic surgery on his right shoulder and recovery time is expected to last eight to 12 weeks.
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Both surgeries were performed by team doctors Ed Khalfayan and Mike McAdam at the Seattle Surgery Center.