Pop elected free agency after being outrighted to Triple-A Lehigh Valley on Saturday.
Pop was designated for assignment by the Phillies on May 30 on the same day that he was reinstated from the 10-day injured list due to a calf strain. He has opted to enter free agency after he was not claimed off waivers, and Pop will have the opportunity to sign with a team in need of right-handed depth out of the bullpen. Pop has a 3.68 ERA and 1.09 WHIP across 7.1 innings in the majors this season.