De Los Santos has spent the vast majority of the season at Jacksonville, where he owns a .283/.347/.496 slash line with 19 homers, 66 RBI, 49 runs and 18 steals through 401 plate appearances. He'll now rejoin the parent club to give the Marlins extra flexibility at first base while Kyle Stowers (hamstring) is on the injured list. Logan Driscoll was optioned to Triple-A in a corresponding move.

With Kyle Stowers (hamstring) returning from the injured list Sunday, De Los Santos will head back to Triple-A in order to get regular playing time. Over his two abbreviated stints in the majors this season, the 22-year-old has gone 2-for-7 with a double and a 0:3 BB:K.