The Bulldogs enjoyed a rousing win over the Knights on Friday night but could be lamenting the loss of prop Sauaso Sue for the rest of the season.
Sue suffered a suspected ACL injury in the 26th minute after Josh King came down on his lower leg, causing it to rotate and collapse.
Coach Dean Pay was not confident with the early outlook on the injury.
"Hopefully it is not an ACL, but it doesn't look good," he told reporters post-match.
Sue was not the only casualty for Canterbury on the night, with Aidan Tolman going down with a rib injury.