Manly have been slugged with a $5000 fine for momentarily having 14 players on the field during the NRL club's 34-14 win over Gold Coast at Skilled Park on Friday.

The breach occurred in the 57th minute when two players were correctly interchanged at the same time.

But according to the Sea Eagles, the wrong player left the field and he immediately returned without the permission of the interchange official.

This resulted in a 14th player being on the field for just a few seconds as another player left the field behind the dead ball line.

Manly chief executive Grant Mayer said the club accepted the penalty.

"We have reviewed the incident on video and concede the NRL rules were unintentionally breached," he said.

The Titans copped a $1000 fine for breaching the interchange rules when a player going on to the field failed to hand the interchange card to the interchange official.

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