"Ultimately it's KT's decision," Gibson said.
Bauer struggled in four Major League starts earlier this year compiling a 6.06 ERA.
"I think we kind of feel it would be beneficial for him to get back," Gibson said. "Things didn't go as planned. We're thinking this year, but next year so it probably makes sense that any kind of experience or exposure that he gets back here and segues back into the environment would be good for him."
Even if he is called up, finding an opportunity to give him a start could be a challenge. Right now the D-backs have Ian Kennedy, Trevor Cahill, Wade Miley, Tyler Skaggs and Patrick Corbin in the rotation.
"That means somebody would have to miss a start," Gibson said. "I don't know anybody that wants to miss a start. There's other issues to deal with. At the same time if we feel somebody should miss a start then he would be a likely choice if he were here."