12:02pm: There is nothing structurally wrong with Tanaka’s shoulder, Bryan Hoch of MLB.com tweets. Tanaka simply told the team that his arm was tired, and the Yankees are giving him a short break.

11:33am: The Yankees have announced that they’ve placed righty Masahiro Tanaka on the 10-day DL with shoulder inflammation. To take his place on the active roster, they’ve recalled righty reliever Giovanny Gallegos from Triple-A Scranton/Wilkes-Barre.

Tanaka has posted a 4.92 ERA and allowed 28 home runs over 133 2/3 innings this season, although his strikeout and walk numbers (9.5 K/9, 2.2 BB/9) have been fine. He left Wednesday’s start against the Blue Jays after allowing five walks in four innings, however.

While a trip to the DL with a shoulder injury doesn’t always mean that injury is significant, it’s certainly worth watching. Tanaka missed time due to arm issues in 2014 and 2015, although those were to his wrist, forearm and elbow, not his shoulder. The seriousness of his current injury is unclear.

In the short term, the Yankees will have to fill a rotation that’s also currently missing CC Sabathia, who’s out with a knee inflammation, and Michael Pineda, who has a UCL injury. The Yankees recently promoted Jordan Montgomery to take Sabathia’s place.

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