Hamilton has not played since Saturday in Minnesota, when he was removed from the game after hitting the outfield wall trying to make a catch.
Despite holding a comfortable seven-game lead atop the American League West -- even with the club having lost its last five games entering Wednesday -- Washington said he will not baby Hamilton back into the lineup.
"[If] Hamilton is ready to go, Hamilton is ready to go," Washington said. "All [extra] time off is going to do is knock his timing off. It's not just a game you can come back and everything will be hunky dory. You have to play this game.
"If we clinched [the division] already, I might think about that scenario, but we haven't clinched."