Manager Davey Johnson said that Werth is still working out the kinks with three rehab appearances in the books.
"Progress is coming along good," Johnson said. "I know one thing -- he didn't feel any weakness in his left wrist."
Despite the fact that Werth has been healing quickly, the Nats have always planned to stay on the same timetable for his return, with their sights set on the first week in August.
Johnson said the decision is primarily up to Werth.
"He'll tell me. I know he's got it figured out," Johnson said. "It was his idea to move from Washington [with Class A Potomac] up to Syracuse, and he likes to take someone with him, so he took Chad Tracy."
Werth went 0-for-6 in games on Monday and Tuesday with Triple-A Syracuse, also seeing some time in center field.
"He's going to be a right-handed center fielder, and that's something I don't have," Johnson said. "He's real good anywhere I put him out there."
Tracy, rehabbing a groin injury, is expected to rejoin the club around the same time as Werth.