Kemp batted .200 in 20 games for the Cincinnati Reds last year before breaking a rib on April 21. He then spent time in the Mets' and Marlins' minor league systems.
Kemp, 35, is a career .285 hitter with 281 home runs in 14 seasons for four teams. He was runner-up for the National League MVP in 2011 and is a two-time Gold Glove winner.
The Associated Press contributed to this report.