No matter whose report you believe, the news was not good for the Steelers.
Ian Rapoport of the NFL Network reported that DeCastro tore the ACL and MCL in his right knee, according to a source.
It will at least be a long break for their first-rounder.
Losing their right guard throws another wrinkle into an offensive line that was already in flux, likely plugging Ramon Foster back into the starting lineup.
UPDATE: 2:42 p.m. ET: Rapoport has updated his report, saying DeCastro’s ACL is not torn.