Sizemore signed with Philadelphia as a minor league free agent in late June and was called up on July 11. His new contract, which includes bonuses for performance, will prevent him from becoming a free agent after the World Series.
Sizemore, a nine-year veteran, split time this year between the Boston Red Sox and Philadelphia. In 112 games, he hit .233 with 27 RBI and five home runs.
In 176 at-bats in 60 games with the Phillies, his batting average was .253, with three home runs and 12 RBI. He was hitting .306 through his first 130 at-bats, but in nine games during September his average fell to .098.
According to Todd Zolecki at MLB.com, Sizemore, 32, is likely to play as a fourth or fifth outfielder, covering every position. In 2014, he had 28 games in left field, 12 in right field and seven in center field, Zolecki added.