"I'm fine," he said.
The Phillies hate to lose Altherr, even for a game. He is hitting .328 (21-for-64) with seven doubles, three home runs, 11 RBIs and a .989 OPS in 22 games.
"I'll still be good by the time I get back," Altherr said.
Brock Stassi started in left field in Altherr's place.
"[Altherr] thought a day would be good for him, which is fine," manager Pete Mackanin said. "Whether he is available to pinch-hit or not, remains to be seen, but I would assume that he is, unless he tells me otherwise."
Todd Zolecki has covered the Phillies since 2003, and for MLB.com since 2009. Follow him on Twitter and Facebook and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.