Rottino had three hits in 28 at-bats in 18 games for Cleveland in 2012 while playing left field, right field and catcher.
Slowey missed most of the season with a stress fracture in his rib cage and spent the entire year with the Indians' Triple-A affiliate, the Columbus Clippers. Cleveland acquired the right-hander from Colorado this past offseason. Slowey last pitched in the majors in 2011 for the Minnesota Twins, when he appeared in 14 games, starting eight, and had an 0-8 record with a 6.67 ERA and 34 strikeouts.
Cleveland's 40-man roster now stands at 34 players.