Sampson was optioned to Triple-A Iowa on Monday, Andy Martinez of Marquee Sports Network reports.

Sampson spent four days on the active roster in his latest stint with the Cubs. His lone appearance came against Atlanta on Sunday, when he tossed 4.2 scoreless innings of relief while striking out five and allowing one baserunner. While that outing was excellent, he'll presumably be unavailable for the next few days, so he'll return to the minors for now.