ARLINGTON, Texas — Twins starter Joe Ryan got a second opinion that confirmed the team’s initial diagnosis of a significantly strained muscle in his throwing shoulder that will keep the right-hander sidelined for an extended period.

Twins trainer Nick Paparesta said Friday that Ryan visited with Dr. Neal ElAttrache in California. ElAttrache reaffirmed the Twins’ diagnosis.

“Felt the same way we did about the injury, being a Grade 2 teres major strain of his shoulder,” Paparesta said. “Joe is going to be down for a period of time that we discussed earlier, weeks probably, and we’ll kind of reassess him at that point in time. You don’t want to say the season’s over at any point in time, so we’ll wait and see how things go once we get a chance to look at him again.”

The update came a week after the Twins put Ryan on the 15-day injured list because of the strain to the muscle that runs from the shoulder blade to the upper arm. Manager Rocco Baldelli said at that time Ryan would be sidelined for “weeks to months,” but stopped short of declaring him done for the season.

There are just over six weeks left in the regular season.

Ryan (7-7, 3.60 earned-run average) was removed from his start Aug. 7 against the Chicago Cubs because of discomfort after throwing a pitch. He has 147 strikeouts and 23 walks in his 135 innings over 23 starts this season for the playoff-contending Twins (69-53).

“I think him going out there and talking to Dr. ElAttrache gave him reassurance. He has seen other players that have had this injury that have all come back and had no issues moving forward with it,” Paparesta said. “It’s just a little bit more of just a comfort factor. He was understanding of what was going on.”

Paparesta said Ryan is maybe able to do day-to-day activities without being affected, “but I don’t think he could go out and throw a baseball without his arm hurting at this point in time.”