Sydney prop Dylan Napa is set for a lengthy stint on the sidelines after an nasty incident involving Brisbane hooker Andrew McCullough in the first half of the Broncos' 22-8 win over the Roosters on Saturday night.

Napa led with his head in a tackle and collected McCullough in the jaw, which knocked the hooker out unconscious before he had even hit the ground.

The incident is reminiscent of one involving Napa and the Broncos earlier on this season, after he broken Korbin Sims' jaw with a similar tackle.

Napa was sent to the bin after his hit on McCullough, and was placed on report.

The Broncos told media at the ground their hooker had regained consciousness, and had not suffered a broken jaw, only a cut to the face.

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