The Brisbane Lions AFL member who threw beer at Western Bulldogs captain Brad Johnson has telephoned both clubs to apologise for her actions.

"The extremely remorseful Sydney-sider, who holds a Victorian-based Lions Membership with AFL entry rights, has expressed her deep regret and embarrassment to the club for her behaviour," the Lions said in a statement on Monday.

The fan has also given the Lions a "firm undertaking never to repeat her behaviour at any future AFL matches".

The Lions said the fan would also send Johnson a letter of apology and had offered to make a donation to a charity organisation chosen by the Bulldogs.

Brisbane Lions Chairman Tony Kelly and chief executive Michael Bowers have also written to the Bulldogs to apologise for the incident at the Gabba on Saturday night.

"We have spoken to the member in question and she is honestly mortified and extremely remorseful for what she has done," Bowers said.

"It seems that it was a 'spur of the moment' error in judgement that she really wants to put right today.

"Saturday's behaviour was totally unacceptable at all Lions AFL matches.

"Let this be a strong reminder to all patrons attending Lions Gabba matches that we have zero tolerance for any objects being thrown onto the field at players - whether it is dangerous or not."

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