After a rough couple of days for the Tigers’ bullpen, the roster is getting a slight makeover. On the plus side, Mike Gerber will return to the major leagues after getting his first taste during last Friday’s doubleheader against the Kansas City Royals. He’ll join the big club in time to travel to Pittsburgh for the club’s three-game series with the Pirates starting on Tuesday. The move gives the Tigers an extra bench option for games played under National League rules. However, the bigger news comes in the form of reliever Drew VerHagen being designated for assignment.