Michael Young served as the DH in Friday's lineup.
Andrus had started nine of the last 10 games for the Rangers, going 12-for-38 at the plate. Andrus was originally on the bench on Thursday, but came in for defensive purposes in the bottom of the 10th in Texas' 5-4 win over the Royals.
"I haven't had a chance to get him a full day [off] yet," Washington said about Andrus. "When I give him a day, I end up putting him in the ballgame. He's been a workhorse."
Washington also hinted at penciling in third baseman Adrian Beltre as the DH in one of the next two games. However, because of Beltre's recent success, Washington might leave that choice in his hands.
"The way Beltre's playing right now, he might not want a DH day," Washington said.
He added that if Beltre wants to play the field, the DH spot could go back to Young or outfielder Nelson Cruz.
Washington didn't seem at all concerned about the artificial turf at Tropicana Field, saying it's not as bad for his outfielders' legs as the Rogers Centre in Toronto.
"It's not springy, so the impact doesn't rush through your body," Washington said. "They don't have those boards underneath it so you can feel it. It's not too bad."