Melbourne Storm will keep a close eye on Billy Slater after he was knocked unconscious during Saturday's NRL win over Canberra Raiders, while captain Cameron Smith is not as badly injured as first feared.
Slater was carried off on a stretcher after being knocked out by a late, high challenge from Sia Soliola at GIO Stadium.
The Australia full-back was able to return home with his team-mates, but will be monitored ahead of the clash with Manly Sea Eagles next weekend.
NRL leaders Melbourne offered an encouraging update on skipper Smith, whose participation was also ended early in the second half due to a shoulder injury.
Storm football director Frank Ponissi said on Sunday: "We were pleased to find out this afternoon Cameron has only suffered a minor tear to his pec, while it's extremely unlikely Cameron will play this Sunday, given the player Cameron is and his resilience to play the amount of games he has over recent seasons, we will give him every chance to do so.
"Otherwise we expect him to be available for selection in Round 22 or definitely by Round 23."