Astros manager A.J. Hinch: Ken Giles' back tightness gotten 'a bit worse'

Houston Astros relief pitcher Ken Giles (53) pitches in the ninth inning of Opening Day at Globe Life Park, Thursday, March 29, 2018, in Arlington. ( Karen Warren / Houston Chronicle ) Houston Astros relief pitcher Ken Giles (53) pitches in the ninth inning of Opening Day at Globe Life Park, Thursday, March 29, 2018, in Arlington. ( Karen Warren / Houston Chronicle ) Photo: Karen Warren/Houston Chronicle Photo: Karen Warren/Houston Chronicle Image 1 of / 11 Caption Close Astros manager A.J. Hinch: Ken Giles' back tightness gotten 'a bit worse' 1 / 11 Back to Gallery

SEATTLE — Astros closer Ken Giles has back tightness that has gotten "progressively a little bit worse," manager A.J. Hinch revealed prior to Thursday's series finale against the Mariners.

"He's been battling a little bit of back tightness and has been unavailable the last couple days," Hinch said. "He was fine (and) when we got to Seattle he reported a little bit of back soreness and it's progressively gotten a little bit worse to where he can't go yet."

Giles was unavailable for Thursday's 9-2 win, after which he said his back problems were "not concerning."

He has not pitched since April 14, a scoreless ninth inning in the club's 6-5, extra-inning loss to the Rangers.

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"Probably just slept wrong and it just tightened up on me," Giles said after the game. "I'll be ready to go tomorrow."

Giles has just one save this season, during which he only recorded one out. He allowed an extra-base hit in three of his first four outings and an earned run in two of those. Giles has just two strikeouts in five innings, too.

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Giles was up and warming in Sunday's game against the Rangers, Hinch said, and reported the stiffness once the team arrived in Seattle. Hinch said the club has not broached disabled list talk yet, but added the inactivity is concerning.

"As it grows a little bit longer, we don't want him to miss too much time," Hinch said. "Right now, we don't think it is, but right now given that he can't move around and do the things that he normally does, it's a little concerning. But we haven't talked DL yet."

Hinch turned to Chris Devenski for the ninth inning of Tuesday's 4-1 win, when Seattle brought two lefthanders to the plate. Collin McHugh — who threw the ninth inning of Wednesday's 7-1 win — was also up in the bullpen during the ninth inning of Tuesday's game.

Devenski, Giles and Brad Peacock each have a save this season. Devenski leads the team with two.