Investigators have been told the 30-year-old cyclist was travelling north along St Kilda Road when he was nearly hit by a vehicle turning out of Albert Road about 7.20am.

Police said the male driver of the vehicle, believed to be aged in his 40s, pulled over near a tram stop, approached the cyclist and an argument took place.

The man then punched the cyclist on the chin and left the scene in his vehicle. He is described as Caucasian with a solid build, shaved head and grey facial hair. He was driving a white sedan, possibly a Suzuki.

Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or visit www.crimestoppers.com.au.