Peacock will move from the bullpen and start Tuesday against the Mariners, Chandler Rome of the Houston Chronicle reports.

Astros manager A.J. Hinch hinted that this might be a bullpen game, so it's not expected that Peacock will work long enough to qualify for a decision. The manager said he will "mix and match" among the nine relievers at his disposal, reinforcing the notion that Peacock's start will be an abbreviated one. Peacock, who has 67 starts during his career, has not thrown more than 40 pitches in an appearance this season. With Lance McCullers (forearm) facing an uncertain return date, Peacock could be built up his subsequent outings and gradually take on a normal starter's workload.

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