WASHINGTON -- The Philadelphia Phillies placed ace Zack Wheeler on the 15-day injured list Saturday with a blood clot in his right arm.

President of baseball operations Dave Dombrowski said after the Phillies' 2-0 loss to the Nationals that Wheeler had been diagnosed with a "right, upper extremity blood clot."

"There's not a lot that we can say on it at this time," said Dombrowski, who commended doctors for finding the clot. "It could have been a much more trying situation than it is."

Wheeler pitched Friday against Washington and was limited to five innings for the second consecutive start. The right-hander allowed two runs and four hits.

Phillies head athletic trainer Paul Buchheit said Wheeler had been feeling better after some right shoulder soreness, but that changed Frida

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