The 28-year-old right-hander opened the season as the No. 4 starter, but he came down with a strained right forearm after his first start and missed two months.
Since coming back, Wells has not been effective, and he takes a 1-3 record and 6.71 ERA into Saturday's start against Houston at Wrigley Field.
Although veteran pickup Rodrigo Lopez has out-pitched Wells of late, he will move to the bullpen for the time being, largely because of off-days Thursday and next Monday, while Wells gets a chance to regain his form.
"Lopez has pitched really well," manager Mike Quade said. "It's a commitment to me from Wellsie right now to say, 'Look, you've been a big part of this thing. Keep working, but progress is important.' So we'll do this for the Houston series."
However, Quade did not go as far to say Wells is pitching for his job.
"I don't know about that," Quade said. "He needs to pitch. He needs to make progress, and I would love to see him pitch the way I've seen him in the past. I'm hoping for as good an outing as we've seen from him in quite some time."
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