Steelers rookie David DeCastro went down with a nasty looking knee injury tonight and there’s a good chance he suffered a torn ACL.
Mike Tomlin called DeCastro's injury "potentially severe." I'm told it's prob ACL but won't know till tomorrow.
— Gerry Dulac (@gerrydulac) August 26, 2012
Defensive end Brett Kiesel on the other hand has a high ankle sprain.