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The Mariners made a surprising roster move just before Friday’s first pitch, placing right-handed pitcher Hisashi Iwakuma on the 15-day disabled list with a strained right latissmus dorsi. They recalled left-handed reliever Lucas Luetge to take his place on the 25-man roster.

It was surprising announcement considering Iwakuma was playing catch earlier in the afternoon. But with trainer Rick Griffin and pitching coach Rick Waits out there monitoring the situation, it should have been a minor red flag.

General manager Jack Zduriencik provided some clarification about Iwakuma’s injury.

“After his start, he said that he felt a little fatigued in his shoulder,” Zduriencik said. “So what we thought we’d do is wait till his bullpen session on Friday to see how he felt. And the same thing was the case.”

Iwakuma was put on anti-inflammatories on Tuesday and then went about his normal preparation

There is no word as to when the injury occurred, but Iwakuma’s velocity in his last outing was down about three to four mph on his fastball. Iwakuma is undergoing a MRI to find out the degree of the strain.

Iwakuma was scheduled to start on Sunday for the Mariners against the Minnesota Twins. Sources have said that Roenis Elias will make that start instead on Sunday. Elias was scheduled to pitch on Saturday for the Rainiers. He’ll likely be recalled on Saturday and be at Safeco Field. Luetge gives the Mariners an extra arm for tonight’s game.