"We have to keep evaluating him and see where he is at," Williams said. "It's still a little swollen. He had an X-ray that was negative. We'll see how he reacts to it and all the treatments."
Escobar left Thursday's game against the Cubs after one inning after hurting the wrist on a check swing.
With Escobar out of the lineup, Anthony Rendon was back at third base, while Danny Espinosa started at second base. Escobar is off to a great start for Washington, hitting .316 with two home runs and 14 RBIs.
Right-hander Doug Fister, who is on the disabled list because of right forearm tightness, will make a rehab start for Triple-A Syracuse on Sunday.
Fister has already thrown two bullpen sessions and was able to throw all of his pitches.
"I can't complain," Fister said. "Everything has progressed the way we wanted it."