SEATTLE -- Stephen Pryor was placed on the 15-day disabled list by the Mariners on Monday after the right-handed reliever was diagnosed with a tear in the latissimus dorsi muscle behind his right shoulder.
Pryor, 23, felt tightness in his back during Sunday's victory over the Rangers and was taken out of the game after pitching 1 1/3 innings. The tear in his lat muscle was discovered during tests by Mariners medical director Edward Khalfayan.
The Mariners were off Monday, so a roster move to fill Pryor's spot on the 25-man roster won't be announced until prior to Tuesday's 7:10 p.m. PT game against the Tigers.
Pryor pitched in seven of the Mariners' first 14 games this season and had not allowed a run in 7 1/3 innings. The hard-throwing youngster allowed just three hits and one walk, while striking out seven.
Pryor appeared in 26 games last year for Seattle after a midseason promotion, posting a 3-1 record and 3.91 ERA in 23 innings.
The Mariners could recall Lucas Luetge, who was just sent down to Triple-A Tacoma last week, though that would give the bullpen four left-handers. Available right-handed relievers in Tacoma include Logan Bawcom, Danny Farquhar, Jhonny Nunez, Brian Sweeney and Yoervis Medina.
Of that group, only Medina is on the 40-man roster, so any other promotion would require a move to create a spot.
Veteran right-hander Kameron Loe was claimed off waivers by the Cubs on Saturday after being designated for assignment last week by the Mariners. Josh Kinney, another veteran right-hander, is on the 60-day disabled list with a stress reaction in his ribs.
Hector Noesi, who has worked some in relief in the past for both the Yankees and Mariners, was just promoted to Tacoma from Double-A Jackson on Monday after pitching 11 scoreless innings with five hits, three walks and 12 strikeouts in his first two starts with Double-A Jackson.