Oakland Athletics closer Mason Miller says he's open to returning to the starting rotation in the future.

However, Miller is comfortable as a reliever where he's enjoying success.

"I don't think I want to close that opportunity," Miller said of possibly starting someday. "If the opportunity presents itself, maybe, but with the success I've had [as a closer], I think it's a difficult decision to say I want to get away from that."

Miller, 25, has been mentioned in trade rumors, but with five years of club control remaining the decision will be a difficult one for the A's as the deadline nears.