"Chase Utley has a concussion and probably won't play for the remainder of this roadtrip, Phillies general manager Ruben Amaro Jr. said on Friday morning.

"He's going to be re-examined on Saturday," Amaro said. "If the test goes well, he could go ahead and meet the team in Houston on Monday. But I don't expect him to play the next two series just so we can be cautious. That's my guess."

One of those series is the current one against Milwaukee. It runs through Sunday. After that, the Phils play three in Houston beginning on Monday. The Phils return home on Thursday for a doubleheader with Florida then entertain St. Louis beginning Friday. Amaro mentioned that Utley might not play until the St. Louis series.

Utley was hit in the back of the head by a pitch on Wednesday night. Tests in Philadelphia revealed a mild concussion, Amaro said.

"It's very mild, we think it's very slight, but it's a concussion nonetheless," Amaro said. "Chase is already feeling better. He's getting some rest. We'll know more Saturday.""