"We went out there to check on him and the hamstring came up, and just with that history we were extra cautious," Reds manager Bryan Price said of Chapman, who dealt with an injured hamstring last season. "And by the sounds of it, it may be a non-issue completely."
TV cameras caught Chapman yelling at catcher Brayan Pena following the top of the fifth.
"By the time the smoke cleared, Chappy was back in the dugout and Brayan got back in the dugout after the half-inning, I just think there might've been a misunderstanding," Price said. "So it's fine. It's frustrating for Chappy but in the big picture, nothing critical."
Chapman, 27, posted a 2.00 ERA with 36 saves and 106 strikeouts in 54 appearances last year.
Cash Kruth is a reporter for MLB.com. Follow him on Twitter at @cashkruth. This story was not subject to the approval of Major League Baseball or its clubs.