Decker, 30, has only 11 major league at-bats in his career coming with the San Diego Padres in 2015. He went 0 for 11 with five strikeouts and played three games at first base.
Last season, the right-handed hitting Decker spent his time split between Triple-A and Double-A. He hit a combined .230/.284/.484 with 19 home runs, 46 RBI and 109 strikeouts in 84 games.
Decker is career .262/.341/.520 hitter with 173 home runs and 550 RBI in eight minor league seasons.
He has played a majority if his time at first base, but has also played third base, catcher, left field and right field in the minors.