"It's literally day to day at this point," manager Bob Melvin said. "The one thing he can't simulate is getting out of the box, and it's tough to tell a guy to be careful. But I certainly don't think we're looking at a DL thing, and hopefully it's just a couple of days."
Brandon Moss got the start in left field on Friday in place of Cespedes, who sustained the injury during the seventh inning of Thursday's 10-1 victory when legging out an infield single.
It was just Cespedes' second hit in his past five games, spanning 15 at-bats. On the season, he has batted .238/.316/.464 with four home runs and 14 RBIs through 22 games.
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.