With a spot open on the 25-man roster, right-handed reliever Mayckol Guaipe was recalled from Triple-A Tacoma. The move is retroactive to April 22.
Benoit was first diagnosed with shoulder problems about two weeks ago and was held out of a few games because of it.
In total, Benoit has only made five appearances for the Mariners this season posting an ERA of 3.60 while striking out four along with walking four.
Since the diagnosis that came on April 11, he has pitched in three games on April 16, 20, and 21. The latter game was against Cleveland in which he gave up a two-run home run to Mike Napoli.
Guaipe made his Major League debut with Seattle last season and has split time between the big leagues and the minors. He has pitched in 21 games for Seattle and has posted a 5.40 ERA. This season in Triple-A, he has a 2.16 ERA and three saves in six games.
The Mariners acquired Benoit from the Padres in the offseason to be their eighth inning set-up man, but the Mariners will now have to look elsewhere in their bullpen to do so. That could be someone like Joel Peralta, Nick Vincent, Tony Zych, or it could be a committee type situation.
This reworked Mariners bullpen has been very solid in 2016 after an abysmal 2015 season. They are still awaiting the arrival of southpaw Charlie Furbush who is working on his return from the DL.