An 18-year-old woman has called Geelong AFL star Paul Chapman a "bloody joke" in the aftermath of a weekend street brawl that police are investigating.

Officers were called at about 4.55am (AEST) on Sunday to a fight outside a 7-Eleven store in Moorabool Street, Geelong, where it is believed Chapman may have been involved in a fight.

Club officials spoke with the star player on Monday after the woman came forward with her claims.

Chapman played for the reigning AFL premiers when they lost to Collingwood the previous night in the preliminary final.

Alex Woollett, a bar worker, says Chapman went nuts after he sat and rolled on her friend's car.

"Paul Chapman ... ment to be an idol ... he's a bloody joke!" she wrote on public online Facebook postings under the name "Alickz".

"He jumped on my mates BMW bonnet whilst he was driving and he stopped in the middle of the road and got out the car."

She said she didn't provoke the altercation but ended up between her friend and Chapman trying to keep them apart.

"And I shoved him just like as in how you'd usually say back off.. And he went nuts so then I went nuts..."

Geelong Police are investigating and will review CCTV footage of the incident and speak to people who witnessed the brawl.

No one was arrested on the night and no charges have been laid.

A police spokeswoman would not comment on Monday but confirmed the investigation.

Geelong Football Club football manager Neil Balme and president Frank Costa would not comment about the allegations, with Balme saying "it was not in our interests to do so".

The club released a statement confirming that Chapman was involved in "an incident".

"No other players were involved. Paul is fully co-operating with the Geelong Police on the incident," the statement said.

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