Glen Perkins, who has been suffering from back spasms, suffered a setback earlier this week that is preventing him from traveling on the Minnesota Twins' current roadtrip.

According to Rhett Bollinger of MLB.com, Perkins woke up on Wednesday morning with the same back issues after pitching one inning on Tuesday. 

"I honestly don't know what happened," Perkins said. "I pitched Tuesday. That day I would have said I felt 90-95 percent and everything was good, everything was fine. I pitched. I didn't think anything of it after the game and then when I woke up yesterday, I couldn't get out of bed. It completely blindsided me -- so yeah, I don't feel any better today. It's going to take a little bit more time than it did the last time."

According to Twins manager Paul Molitor, reliever Kevin Jepsen, who was acquired from Tampa Bay at the trade deadline, will take over as the closer on the road trip that will take the Twins to Houston, Kansas City and Chicago.

"I talked to him last night and he said he went home after pitching the other night and had no thoughts of anything physical," Molitor said. "But he got up and things changed. He thought it was something he could get through yesterday, but instead it got worse. So it's a tough thing because you can't inject it, it's not anything that needs that kind of attention other than trying to find ways to calm it down."

Phil Hughes, meanwhile, threw a 35-pitch bullpen session on Thursday with no issues, and remains on his road to returning from the disabled list, which he has been on since August 10th with lower back inflammation.

"It was good," Hughes said. "It was a pretty good effort for about 35 [pitches]. I felt great. Got through it. If I feel good tomorrow, the plan is another one on Sunday of about 40 or 45. And then meet the team the last day in Kansas City [on Wednesday] for a simulated game. That's kind of the plan right now."

While he admitted that his back will not be fully healed until the offseason, Hughes is hopeful that he will be able to return to the starting rotation by the end of the season, and in time for a potential playoff appearance.

"It's always going to be there until I have a full offseason to rest it," Hughes said. "But right now, I don't have the luxury of waiting until I'm 100 percent and symptom-free. I'm just doing everything I can to build it back up."