Sampson was optioned to Triple-A Louisville on Saturday.
Sampson fared surprisingly well in a spot start against Milwaukee last weekend, giving up one run on just two hits while striking out four over five innings. He gave some of that goodwill back in a relief appearance Friday, allowing a run on a hit and two walks in an inning against the Dodgers, but Sampson may have shown enough to be considered for a couple additional spot starts in September.