Seattle Mariners right-hander Bryan Woo has been diagnosed with minor inflammation in his pectoral muscle, according to what manager Dan Wilson told reporters ahead of Saturday's game versus the Houston Astros . Woo underwent imaging after departing Friday's start before he could officially begin the bottom of the sixth inning.

Wilson noted that the Mariners remain uncertain if Woo will require a stint on the injured list -- and that they'll need another 24-48 hours before they can make a call. That won't be a light decision because players who are placed on the IL during the regular season must serve their full stint before they're eligible to return for the playoffs.

"I just felt a little tightness," Woo said on Friday . "I tried to come out and throw that sixth and didn't fee

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