Fremantle have been warned to be on the look-out for symptoms of swine flu among their AFL players and staff.

In the latest concern in what has been a wretched season, the Dockers realised they were on the same flight as a man who has been confirmed as Western Australia's first swine flu case and has since been put into quarantine.

A travelling party of about 40 Fremantle players and staff were on the flight from Melbourne to Perth on Saturday night, following their defeat to North Melbourne at Etihad Stadium.

The Dockers players underwent medical checks at training on Monday, and the club has been briefed by the WA Department of Health in terms of what action to take if any players or staff members showed symptoms of the virus.

It is understood Fremantle officials contacted the department when they realised a staff member who was not part of the official touring party had been sitting nearby the man - a 30-year-old father of eight - who had fallen ill.

"As a result, this staff member is receiving direct advice from the Health Department and our club doctor," Fremantle chief executive Steve Rosich said.

The Dockers are confident no members of the official travelling party had been in proximity with the ill man, and the club contacted the department as a precaution.

Rosich said no Fremantle players or staff had shown any symptoms of the virus and did not need to be put into quarantine.

But the Dockers have been told by medical staff to be on the look-out for any signs.

"We've been briefed about it and whilst none of our players have shown any symptoms, we've been shown what to do and told to talk to the doctors if some of those symptoms arise," midfielder Paul Hasleby told Network Ten.

The man confirmed as WA's first case was returning home after travelling from Canada and the United States to Melbourne when he took the same flight as Mark Harvey's team.

WA Health Minister Kim Hames on Monday said the man called an ambulance when he fell ill on Saturday night but had since displayed only mild symptoms and has been released into quarantine with his family.

An AFL spokesman said the Dockers had been keeping the league up to date, and that the matter was one between Fremantle and the health department.

Fremantle at least avoid having to fly this weekend as they host Richmond at Subiaco Oval on Sunday.

But the health scare comes amid a sickly on-field season for the Dockers, who sit in 14th spot on the ladder with a win-loss record of 3-6.

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