Three men have been killed and another is fighting for life after the car the winery workers were in rolled and crashed into trees in northern Victoria.

Two 21-year-old Canadian passengers and an unidentified driver were killed when their car rolled on a turn at Dingwall about 12.30am on Sunday.

A 19-year-old British man was flown from the scene to Royal Melbourne Hospital where he remains critically injured. A 29-year-old German man was also injured.

“It is believed all five occupants of the vehicle were in Australia on a working visa and up until now had been working nearby at a local winery,” Acting Assistant Commissioner Tim Hansen told reporters in Melbourne.

“It is also believed that prior to thee collision that all five occupants had been drinking at a nearby hotel.”

Authorities are now working to contact the next of kin of all five men and help with travel arrangements.