The Red Sox have agreed to a guaranteed major league contract with outfielder Grady Sizemore, reports Jon Heyman of CBSSports.com. It's a one-year deal that can be worth up to $6 million based on incentives.

Sizemore, 31, has not played since 2011 due to continued injury problems. He has had seven surgeries since 2009: left elbow (2009), sports hernia (2009), left knee (2010), another sports hernia (2011), right knee (2011), lower back (2012) and another on the right knee (2012). It's a long list.

Before the injuries, Sizemore was one of the best and most dynamic players in baseball. He hit .281/.372/.496 (128 OPS+) with 107 home runs and 115 stolen bases from 2005-08 and received MVP votes all four seasons. Since 2009, Sizemore has hit only .234/.314/.413 (93 OPS+) in 210 games.