Glover, 31, went on the 15-day disabled list on July 11 with a left calf strain, and the Rays used his roster spot to activate Troy Percival. But upon Glover's return, the Rays did not feel they had anyone in the bullpen they wanted to bump in favor of Glover, who was 1-2 with a 5.82 ERA in 29 games this season.
"There's just no room [in the bullpen] right now," Rays manager Joe Maddon said. "There's no real complicated explanation. I like him and he fits in well here."
Glover, who is making $1.075 million this season, appeared in 67 games for the Rays in 2007, posting a 6-5 record with a 4.89 ERA.
"The second half of last year, I thought he pitched really well," Maddon said. "He hasn't hit that stride yet [this year]. He got more opportunity last year also, whereas this year he hasn't had as much opportunity. But I think right now, physically, he's throwing the ball as well as he did when he did get hot. It's not good not having him, because I think that he's about ready to pitch well."
Glover is out of options, which means the Rays might not be able to keep him in the organization. The Rays have 10 days to trade, release or pass him through waivers, which would allow them to send him to Triple-A Durham.
"I would like to see him clear waivers and go to Durham," Maddon said. "We would wish that he would go through the process, just like Grant [Balfour] did [earlier in the season]. If we could sneak him through and it happened, that would be good for us."
Bill Chastain is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.