NRL referees' boss Tony Archer has admitted the video bunker bungled a no-try decision against the Warriors during their win over the Roosters.

Archer said Roosters utility Aidan Guerra should have been sinbinned after grabbing Ryan Hoffman, who was chasing a grubber kick from Jeff Robson.

Archer says the bunker was correct in not awarding a penalty try, but the Roosters should have paid a heavier price than only conceding a penalty following Guerra's professional foul.

"Obviously there are a number of elements to this decision...it's not a penalty try because (Roosters fullback) Latrell Mitchell is very present there and the ball is loose," said Archer.

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"In relation to the interference, only a penalty was awarded. It is the responsibility of all officials to assess the seriousness - in this particular breach the player should have been sin binned."

The Warriors won the game 32-28 in Sydney with a try to Roger Tuivasa-Sheck in extra time.