SEATTLE – After making one turn through a six-man rotation following the return of Bryce Miller, the Seattle Mariners are making a tweak for the next time through.

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Manager Dan Wilson said Friday the plan is for the club to piggyback Miller and fellow right-hander Luis Castillo during the next turn. The M’s have yet to decide which of the two will start.

“That’s the approach we’re going to take and we’re ready to roll,” Wilson said. “I think our guys are in a good spot in terms of getting an extra day here, and I think that’s gonna come up huge for some of these guys.”

Miller, who started the season on the injured list with a left oblique strain, made his season debut Wednesday night in Houston, tossing 5 1/3 innings of two-run ball on 81 pitches. Castillo pitched Thursday’s series finale against the Astros, allowing three runs on four hits and three walks while striking out six over 5 2/3 innings.

The pair is lined up to pitch Tuesday’s home game against the Chicago White Sox. Miller will have had five days of rest, while Castillo will have had the typical four.

Wilson said both players have been accepting of the decision.

“I think they were definitely in a good spot with it and understand it,” Wilson said. “And I think these guys, as we’ve talked about, these guys in this clubhouse, all of them want to do what’s best for the team. And these guys have really taken to that and they’re ready to go.”

Wilson acknowledged that a piggyback situation could get complicated by game flow and situations, but pointed to the potential benefit it could have in giving the bullpen a night off. Either way, it’s a situation that will be evolving for the club as they go.

“This is something that we haven’t done before, so it’s going to be a lot of waiting and seeing and understanding and assessing and making our adjustments as we go,” he said. “But in theory, you can lay it out, and you just don’t know how it’s actually going to play out. So we have to be open to different ways to proceeding, but we’ll take a look at it when we get there.”

The Mariners’ decision to go to a six-man rotation then a piggyback situation with Castillo and Miller come after widespread speculation about what the club’s plans would be when Miller returned from the IL.

When the season started, the assumption was right-hander Emerson Hancock would once again find himself as the odd man out when Miller returned. However, Hancock, a first-round pick at No. 6 overall in the 2020 draft, has earned himself a spot in the rotation during a breakout start to his season. In nine starts this year, he has a 3-2 record, 3.02 ERA and 56 strikeouts to 10 walks over 53 2/3 innings.

Castillo’s spot in the rotation started to come into question after the veteran started to struggle following a strong first start of the season. In seven starts from April 5-May 9, Castillo posted a 7.79 ERA over 32 1/3 innings and batters hit .329 against him. But his most recent start against Houston marked a step forward for the three-time All-Star and highest-paid pitcher on the Mariners’ roster.

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