Ryan Zimmerman. (Photo by Justin Edmonds/Getty Images)

Six days after Ryan Zimmerman went on the disabled list with a “pretty substantial” right hamstring strain, the Nationals have yet to provide a timetable on Zimmerman’s return. Nationals Manager Matt Williams said before Monday’s game in Miami that there were no new updates on Zimmerman.

Zimmerman is still resting, and Williams said he had yet to speak with team doctor Wiemi Douoguih, who was expected to evaluate Zimmerman on Monday. Nationals General Manager Mike Rizzo said over the weekend that Zimmerman was seeing a physical therapist and already had a diagnosis, and Zimmerman’s condition would be readdressed when the Nationals return from the current road trip.

Williams said the Nationals could have an update on Zimmerman following Monday’s game or Tuesday.

“He’s got a pulled hammy and he’s not doing anything strength-wise at this point,” Williams said. “It’s just kind of a check-up.”

While the Nationals have yet to reveal a timetable for Zimmerman’s return, it is fair to ​assume Zimmerman will be out for a while, perhaps the majority of the rest of the regular season. He suffered a substantial hamstring strain, which takes several weeks to heal. It’s also an especially risky injury to rush back from, so the Nationals would need to wait until Zimmerman is 100 percent if they do not want his status to remain in doubt for a potential playoff run.

Last year, Wilson Ramos missed 44 games with a significant hamstring strain.

Rizzo has said he trusts Danny Espinosa to hold down second base while Zimmerman remains out. (Williams has also played Zach Walters and Kevin Frandsen at second.) Given how long Zimmerman will likely miss, though, the Nationals may use the next three days to explore a deal for a better offensive infield fill-in. Some rival officials believe the Nationals will try to add an infielder. The Nationals may prefer to withhold a precise timeline so as not to harm their leverage in trade talks.