A Gosnells man is fighting for life after being the third cyclist on Tuesday to be hit by a car in Perth.

The 43-year old man was knocked from his bicycle by a white ute at the roundabout intersection of Dorothy and Hicks Streets in Gosnells about 3pm.

The man was hit in Gosnells hours after Gabriele Schiller-Brett sustained fatal injuries at this Halls Head intersection. Credit:Nathan Hondros

An ambulance rushed him to hospital where he remains in a critical condition with serious head injuries.

The driver was uninjured and is assisting Major Crash with inquiries.