Vic motorcyclist critical after collision

A motorcyclist was taken to hospital with life-threatening injuries following a collision with a car.

A 50-year-old motorcyclist has life threatening injuries following a collision with a car in Melbourne's north east.

Police believe the motorcycle was struck by a car in Warrandyte South about 11.20am on Saturday morning.

The motorcyclist, who's believed to be from Scoresby, has been taken to the Royal Melbourne Hospital in a critical condition.

The 28-year-old driver of the car is assisting police.