Gipson-Long (groin) completed a three-inning simulated game Tuesday in Lakeland, Evan Petzold of the Detroit Free Press reports.
Gipson-Long was placed on the 15-day injured list Thursday due to a groin injury he had been battling since the first week of spring training. The right-hander went 1-0 with a 2.70 ERA in 20 innings for the Tigers across four starts last season.