The Kansas City Royals and left-handed pitcher Bruce Chen agreed on a one-year contract Thursday.

Chen will receive $3.25 million this season with a mutual option for $5.5 million in 2015 with a $1 million buyout. The deal, which includes additional performance bonuses, will be finalized when Chen passes a physical.

Chen, who became a free agent after last season, has spent the last five years with the Royals, going 45-39 with a 4.32 ERA. He has won 10-plus games in three of the last four seasons.

Chen, 37, is coming off a solid 2013 season after shifting to a relief role. He was 9-4 in 121 innings with a 3.27 ERA, making 15 starts and 19 relief appearances.