Rangers outfielder Joey Gallo is set to begin a rehab assignment at the Rookie level, the team announced. Gallo will have 20 days to work his way back to the majors, barring setbacks.

Gallo hasn’t played since suffering a left oblique strain June 1. The injury cut off a superstar-caliber start for Gallo, who was amid a career-best season when he went down. The lefty-swinging Gallo burst out of the gate with a .276/.421/.653 line (170 wRC+), 17 home runs and a personal-high 3.3 fWAR in 214 plate appearances.