Red Sox closer Koji Uehara is unavailable Saturday against the Yankees, as he is dealing with stiffness in his right shoulder. He'll attempt to long toss Sunday before the Red Sox make a decision in terms of how to proceed, but a stint on the disabled list is possible.
"He's unavailable today," manager John Farrell said (ESPN Boston). "We haven't gotten to the point of any roster move with him. We're still gathering information. We'll look to put him through a little bit of a throwing program tomorrow. That's the next step."
This is also at least worth a passing mention:
According to an MLB source, Koji Uehara's medicals (shared by MLB teams) on his shoulder have been a concern but has pitched through it.— Nick Cafardo (@nickcafardo) April 12, 2014
Uehara told reporters that he had a similar -- but not identical -- situation when he was with Texas in 2012, which caused him to miss 66 games. He did say, "no, not at all," (bostonglobe.com) when asked if this situation could cause him to miss nearly as much time.
Since returning from that injury, Uehara has been one of the best relievers in all of baseball. Combining 2012-2014, Uehara has a 1.25 ERA, 0.59 WHIP and 151 strikeouts in 115 1/3 innings against just 12 walks. He was 21 of 24 in save chances last season and is two for two this year.