Furbush will throw again on Wednesday for the Rainiers. He allowed one run on one hit with a walk and strikeout in Tacoma's 9-4 loss to New Orleans on Monday.
"He feels pretty good. He's just not where he needs to be before he gets back up here," Wedge said. "It's a little bit different when you've got a veteran guy that has been through it or done it before. This is kind of his first go-round with something like this."
Furbush, 26, has been one of the Mariners' brighter success stories out of the bullpen this season, posting a 4-2 record and 2.17 ERA in 34 games. He's allowed just two earned runs over his last 24 1/3 innings in 21 games for an 0.74 ERA.