DETROIT — A perfect storm of an upper-body workout, too many pitches while warming up in an inning that wouldn’t end, previous shoulder issues and the Mariners’ desire to have a bullpen start Saturday in Toronto sent right-handed reliever Brandon Brennan back to the 10-day injured list Thursday with shoulder inflammation.
“After he played catch (Wednesday), he felt fatigued and didn’t feel quite right,” manager Scott Servais said. “With where we are at coming up on our schedule with a couple of games with an opener and a bullpen day, we really need all of our pieces functioning.