Stewart’s teammate in Double-A, Gerber has done nothing but produce in his minor league career.
The former 15th-round pick is currently batting .294 with a .369 on-base percentage, a .472 slugging percentage and an .841 OPS in 350 plate appearances for Erie.
He’s also added 58 runs scored, 40 RBI, 20 doubles, 11 home runs, 10 stolen bases and a triple.
Similar to Stewart, Gerber seems more likely to debut sometime in 2018 than this season.
Still, the potential is there for the outfielder to be productive in the Majors.
In the event that Upton opts out, the Detroit Tigers could opt to go for a combination of players to replace the All-Star.
The team could utilize Presley and Adduci in one or both of left and right field until Stewart and Gerber are ready to step in later in the season.
So far this season, both Presley and Adduci have proved to be dependable bench pieces in the Motor City.
Presley owns a 102 wRC+, a .744 OPS, eight extra-base hits and three stolen bases in 146 plate appearances.
Meanwhile, Adduci is sporting a 92 wRC+, a .720 OPS and nine extra-base hits in 93 plate appearances.