The Seattle Mariners may be without their ace for the ALDS.

All-Star Bryan Woo’s status for the Mariners’ series against the Detroit Tigers remains uncertain.

Woo left his Sept. 19 start against the Houston Astros with pectoral inflammation. He made about 25 warmup pitches Thursday before throwing a 15-pitch simulated game against live, non-swinging hitters.

Woo described it as a “positive day,” but he declined to comment on his ALDS status.

“I’m not going to put any assumptions out yet,” Woo told reporters, adding he’s taking things day by day.

“I’m still not where I want to be in terms of game speed of everything,” the right-hander said. “But in terms of how everything has progressed, I’m happy with it. Considering that a week ago, I wasn’t even throwing yet — and then a week from now, hopefully we’ll be in a better spot.”

The Mariners don’t have to submit their ALDS roster until Saturday morning before Game 1 versus the Tigers. Seattle is expected to announce its Game 1 starter Friday, with Luis Castillo, Logan Gilbert and George Kirby being the candidates.

“I have all the faith in the world with all of our pitchers — starters, relievers, whoever it is — that they’re more than capable of doing the job like they have been all year,” Woo said.

Woo is 15-7 with a 2.94 ERA over 186 2/3 innings this season.

The time for Game 1 between the Mariners and Tigers has yet to be determined. Detroit advanced from the wild-card round Thursday with a 6-3 win over the Cleveland Guardians.

–Field Level Media