Maton told reporters that he had surgery on his hand to repair a fractured metacarpal in his right pinkie and will not be pitching in the postseason.
SEE ALSO: What to know about Astros-Mariners ALDS games 1 and 2
Maton said he was not happy with his outing in the Astros' season finale game in which he gave up two earned runs and recorded just one out in the eighth inning.
One of the hits Maton surrendered was to his younger brother Nick Maton, who is playing in the National League Division Series with his Philadelphia Phillies.
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Maton figured to be a lock for the roster after appearing in 67 games this season for the Astros, posting a 3.84 ERA in 65.2 innings.
Left-handed relief pitcher Will Smith, whom the Astros acquired from Atlanta at the trade deadline, was the other notable player off the roster for at least the ALDS.
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