"We have a few days here to see how things are going to pan out," interim manager Juan Samuel said.
"The last three games, we've used a lot of those guys [in the bullpen]. I did not want to bring him in [Tuesday] night, when the game was like that. We're just trying to get some more options with him, trying to wait until his mechanics get right."
Bergesen said he hasn't been told anything regarding the team's future plans for him, and he has been learning on veteran relievers Will Ohman and Mark Hendrickson for advice in making the transition to the 'pen.
"I'm staying positive about it," Bergesen said. "Obviously I'm still here in the big leagues -- this is what they need me to do right now."
The 24-year-old Bergesen, who is 3-4 with a 6.75 ERA in 10 starts, said he doesn't consider the move a demotion. He has allowed 41 baserunners in his past 21 innings -- giving up 19 earned runs over that stretch -- and hasn't been able to find the consistency that helped him go 7-5 with a 3.43 ERA as a rookie.
Bergesen hasn't pitched since June 2 in New York, a game he started but lasted just 2 1/3 innings before former manager Dave Trembley went to the bullpen.
"I don't know what's going to come tomorrow -- I know that I'm in the bullpen today," Bergesen said Wednesday afternoon. "I'm not really worried about [what's coming]. It's my first time being in the bullpen, I'm going to go out there and try to do my thing and hope for the best right now."