Skubal (elbow) is scheduled to throw a bullpen session Friday, Jason Beck of MLB.com reports.
It will be the first mound work for Skubal since he underwent left flexor tendon surgery last August. The 26-year-old southpaw still has many boxes to check in his rehab, but he could perhaps be an option for the Tigers' starting rotation around early June. He was placed on the 60-day injured list before Opening Day.