Pryor has given up two runs in 9.2 innings at Triple-a Rochester since returning from a knee injury.

Pryor struggled early in the season and then missed almost two months after surgery to repair a torn meniscus in his left knee.

Pryor underwent surgery Wednesday to repair a torn meniscus in his left knee, the Minneapolis Star Tribune reports.

Pryor had struggled to begin the season by allowing 13 earned runs and 12 walks in 12 innings.

Pryor was outrighted off the 40-man roster Sunday, Phil Miller of the Minneapolis Star-Tribune reports.

Pryor's spring training didn't go terribly, allowing just one run over six innings, but it appears the Twins don't think he's ready to be part of the major league roster. The move was likely made to open up a 40-man roster spot for Blaine Boyer and Shane Robinson, who are expected to make the roster out of spring training after coming in as non-roster invitees.

Pryor was optioned to Triple-A Rochester.

Pryor made five appearances this spring, allowing one run on four hits in six innings with one walk and one strikeout. He lost much of 2013 to shoulder issues and eventually underwent surgery to repair a torn lat, which caused his 2014 season to be delayed until July. He struggled initially last year (4.65 ERA) before finding his form after being traded to the Twins (0.89 ERA and 22 strikeouts in 20.1 innings at Triple-A, but with 16 walks). The Twins likely feel he needs more time in the minors to get back to full speed.

Pryor is in the running for one of Minnesota's final two bullpen spots, the Minneapolis Star Tribune reports. He has a 1.50 ERA but just a 1:1 K:BB ratio in six innings this spring.

Pryor is a long shot to win the job as he likely needs to prove he's back to full speed in the minors. Pryor lost much of 2013 to shoulder issues and eventually underwent surgery to repair a torn lat, which caused his 2014 season to be delayed until July. He struggled initially last year (4.65 ERA) before finding his form after being traded to the Twins in July (0.89 ERA and 22 strikeouts in 20.1 innings at Triple-A - but 16 walks).

Twins acquired RHP Stephen Pryor from the Twins for 1B/DH Kendrys Morales; assigned him to Triple-A Rochester.

It's essentially a salary dump. Pryor has spent the majority of the 2014 season at Triple-A Tacoma, where he owns an underwhelming 4.65 ERA in 31 innings. The 25-year-old right-hander could join Minnesota's bullpen soon, but only as a middle reliever.

Mariners optioned RHP Stephen Pryor to Triple-A Tacoma.

Pryor walked two and allowed a run in a relief appearance with the Mariners on Wednesday night against the Twins. He was up in the majors for less than 24 hours.

Mariners recalled RHP Stephen Pryor from Triple-A Tacoma.

Pryor has posted a rough 4.91 ERA and 1.44 WHIP in 25 2/3 innings of relief this season at Triple-A Tacoma while fighting a shoulder injury. He'll be a mop-up man.

Stephen Pryor has been placed on Triple-A Tacoma's disabled list with a right shoulder impingement.

The hope is that he'll be ready to resume throwing in a week or so. Pryor is working his way back from lat surgery and was optioned to Tacoma last month. Obviously, he won't be an option for the big league bullpen for a while.

Mariners activated RHP Stephen Pryor from the 15-day disabled list; optioned him to Triple-A Tacoma.

Pryor is recovered from lat surgery, but the Mariners want him to work against a lower level of competition before considering him for a major league bullpen spot.

Stephen Pryor (lat) will begin a rehab assignment with Double-A Jackson on Thursday.

Pryor is a bit ahead of schedule in his recovery from major lat surgery, as he's been pitching in games for nearly two weeks. He could rejoin the Mariners' bullpen before the end of the month.

Mariners placed RHP Stephen Pryor on the 15-day disabled list, retroactive to March 21, with a lat injury.

Pryor underwent major lat surgery last August and is still in recovery mode. The Mariners are hoping he'll be ready to join their bullpen by mid-summer.

Stephen Pryor pitched a perfect inning in a Triple-A appearance Saturday.

It was Pryor's first appearance since lat surgery last August. He needed just 11 pitches to get through the inning, touching 93 mph. Pryor should be a factor in the Mariners' bullpen sometime this season.

Stephen Pryor (lat) will appear in a minor league game Saturday.

It will be his first game action since last August's surgery to re-attach his right lat. Pryor is starting to make some real progress but isn't expected to be an option for the Mariners' bullpen until a couple months into the season.

Stephen Pryor (lat) threw 25 pitches in a successful bullpen session on Friday.

The 24-year-old hurler was a bit rusty, but was able to mix in all of his pitches and exhibited good life on his fastball. He isn't expected to be ready to rejoin the Mariners bullpen until a few months into the regular season.

Stephen Pryor (lat) is close to Cactus League action.

Pryor has been taking a cautious approach this spring as he recovers from major lat surgery. The right-handed reliever is expected to miss the first few months of the 2014 regular season. He owns a 2.97 ERA and 10.1 K/9 in 30 1/3 career major league frames.

Stephen Pryor (lat) threw his fourth bullpen session of the spring on Tuesday in Mariners camp.

Pryor is making slow but steady progress in his recovery from major lat surgery. "We're going very slow and deliberate and that's on purpose," said manager Lloyd McClendon. "We're not going to rush this young man. He's throwing good, he feels good. But we need to get that velocity up where it needs to be for him to be the dominant guy we know he can be. You just can't rush the process." Pryor is expected to miss the first few months of the 2014 regular season.

Stephen Pryor (lat) felt good during a 20-pitch bullpen session Sunday.

The 'pen session was his first since undergoing lat surgery last year. Pryor is reportedly recovering ahead of schedule but will still likely miss at least the first couple months of the season.

Stephen Pryor (lat) will throw a bullpen session Sunday.

It will be his first since undergoing lat surgery last year. The Mariners have previously said they weren't expecting Pryor for several months into the season, but manager Lloyd McClendon said Sunday that the reliever is ahead of schedule. Still, he's obviously got a long way to go.

Stephen Pryor (lat) is currently limited to long-toss and doing fielding drills.

It's not clear when Pryor, who was limited to just seven appearances with the Mariners last season, will be cleared to throw off a mound. Team trainer Rob Nodine said last month that the reliever likely won't be ready until several months into the season.