Solis (elbow) was transferred to the 60-day disabled list Friday, Mark Zuckerman of MASNsports.com reports.
Solis was placed on the DL back in April, so the procedural move allows the Nationals to free up a spot on their 40-man roster. The southpaw has been on a rehab assignment with Triple-A Syracuse over the past two weeks, where he's racked up an unappealing 8.10 ERA over just 6.2 innings and owns a .269 BAA, so a call to the majors may be put on hold until the team deems him ready.