The team is eager for his return to the dugout, where he spent 11 of his 26 seasons with the organization as pitching coach.
"We are looking forward to having Cooper back," manager Robin Ventura said. "It's odd him not being here. I'm just glad he's feeling better. It's going to be nice to have him back."
During Cooper's absence, bullpen coach Bobby Thigpen filled in as the team's pitching coach, while Curt Hasler, the organization's pitching coordinator, has served as the bullpen coach.
Hasler's last game with the team was Thursday's series finale against the Blue Jays and as much as he has enjoyed his time with the big club, he said it doesn't feel right with Cooper not around.
Ventura agrees, although he's pleased with the job Hasler and Thigpen have done.
"It's different. Bobby has filled in and done a great job," Ventura said. "Again, it's different not having Cooper there -- the conversations you are use to having in the middle of the game. Definitely looking forward to him getting back with us."
Chris Toman is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.