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The Seattle Seahawks will enter the 2014 season with one less player than they expected to have.

Per a league source, receiver Sidney Rice has decided to retire from football. The source says that the 27-year-old Rice’s decision arises from his history of concussions.

More recently, Rice has been unable to play due to a knee injury suffered during the 2013 season. A torn ACL caused him to miss eight games in the regular season and the playoffs.

Signed in 2011 after four seasons in Minnesota, Rice never came close to matching a breakout season third season in the league. With Brett Favre arriving in Minnesota, Rice generated 1,312 receiving yards in 2009. Since then, he has appeared in 16 regular-season games only once.

Cut after the 2013 season by the Seahawks, Rice rejoined Seattle in April after getting clearance from Dr. James Andrews. Rice was due to earn a base salary of $1 million this year.