The NRL will press ahead with investigations the Bulldogs played with an extra man on the field in the dying stages of their 28-26 win over Penrith.

But there appears little doubt the club will retain their hard-earned competition points.

The Bulldogs were sent into panic mode shortly after their heart-stopping win at CUA Stadium on Saturday night when host broadcaster Fox Sports suggested they may have had a 14th player on the field as Ben Roberts crossed for the match-winning try.

The drama surrounded Roberts' entry to the field in the 76th minute, but replays indicated that Bulldogs skipper Andrew Ryan had in fact left the playing arena on the opposite sideline.

"I'm not aware of any issue," Bulldogs coach Kevin Moore said.

"Until the league gets back to us it's business as usual for us, getting into the videos and preparing for next week."

NRL chief operating officer Graham Annesley said he would await reports from the ground manager and interchange official before commenting on any alleged breach.

"At this stage, I'm not sure exactly what happened, we'll await a report in the morning," Annesley said.

"There seems to be quite a few varying reports about what is alleged to have occurred, but I don't know at this stage whether there has been any breach of the rules."

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