Alvarado, who was placed on the 15-day injured list Wednesday with left elbow inflammation, underwent an MRI that is currently being reviewed, Matt Gelb of The Athletic reports.

EDGE Analysis

More clarity on Alvarado's condition is expected to be available soon, but Phillies manager Rob Thomson admitted that he's "a little concerned, for sure," about the closer's health. Alvarado has been arguably the best reliever in baseball this season with a 1.88 ERA and 24:0 K:BB over 14.1 innings. Craig Kimbrel looks like the top candidate to close for the Phillies while Alvarado is away, with perhaps Seranthony Dominguez, Gregory Soto and Matt Strahm also in the mix.