Pitching coach Don Cooper's bout of diverticulitis is severe enough to prevent him from joining the White Sox for the remainder of this 10-game trip. Cooper, 57, who has been hospitalized since Tuesday, will return to his offseason home in Nashville once he is released with the hope he can rejoin the Sox when they open their next homestand April 19. "He won't be with us in Cleveland or Toronto," manager Robin Ventura said. "He's in enough pain. I talked to him (Thursday). It's one of those, the game never stops. Guys with injuries and getting sick, it's tough." Roving pitching coordinator Curt Hasler will join the team in Cleveland, while bullpen coach Bobby Thigpen will continue to handle Cooper's duties in the dugout. Bullpen catcher Mark Salas will handle Thigpen's bullpen duties with an assist from Hasler. "The quicker (Cooper) can get back, the better," said Thigpen, who said he has spoken to Cooper during the day. "It's weird. Basically we talk about the same stuff, keeping the guys on the same track they're on." Back to normal: Despite not having the services of Dayan Viciedo and Adam Dunn in the same lineup for three consecutive games, the Sox liked playing three early interleague games under National League rules with no designated hitter. "The pitchers like it, they can swing the bat, and the bench guys are always ready," Ventura said. "You never know when you have to go in. Everybody's alert."