What It Means:

The diagnosis means Tommy John surgery may be necessary. DeSclafani is hopeful rest and rehab will do the trick, but the 26-year-old right-hander isn't someone you want to draft in standard leagues. Look for the Reds to hand over Opening Day duties to Brandon Finnegan with DeSclafani now unavailable.

DeSclafani twirled a 3.28 ERA, 1.22 WHIP and 20.7 percent strikeout rate -- all career-bests -- across 123 1/3 innings last season. He went 9-5 in 20 starts.