"He's got a left wrist contusion," Jennings said. "He's day to day. Hopefully it is mild and he will be ready to go. But it affected him swinging the bat."
The fourth inning started with Gillespie attempting to make a diving catch on Andres Blanco's liner. But the ball caromed off the outfielder's wrist all the way to shortstop Adeiny Hechavarria. The play went for a double.
Gillespie's errors came on plays at the plate. The first came on Freddy Galvis' sacrifice fly. Gillespie's throw ended up deflecting off the foot of Odubel Herrera near the plate.
The second error came when Gillespie's throw home on Jerad Eickhoff's two-run single to left got away from catcher J.T. Realmuto, allowing the runners to advance.
Gillespie has impressed as a reserve outfielder, batting .319 in 43 games since he was called up from Triple-A New Orleans.
Derek Dietrich replaced Gillespie in left field in the top of the sixth inning. Dietrich's homer in the seventh inning accounted for Miami's lone run.
At the plate, Gillespie was hitless in two at-bats Friday. In the second inning, he initially was ruled to have an infield single. But the Phillies challenged that third baseman Blanco's throw got Gillespie. After a replay review, the call was overturned.
Joe Frisaro is a reporter for MLB.com. He writes a blog, called The Fish Pond. Follow him on Twitter @JoeFrisaro and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.