Finnegan (hamstring) threw a simulated game Sunday morning, Mark Zuckerman of MASNSports.com reports.
Given the righty's fairly brief absence, it's possible the simulated game may deem a rehab assignment unnecessary, in which case Finnegan would be no more than a couple days from returning. There's been no indication from the Nationals, however, of whether he'll head to Triple-A Rochester for some additional work.