A teenage boy has been charged after he allegedly stabbed a man 14 times after robbing him of 20 cents.

Police say the 15-year-old was one of two youths who approached the man as he was walking back to work from a laundromat in Footscray, in Melbourne's west, at 2.15pm (AEDT) on November 29.

The 23-year-old man from Bundoora told police the youths demanded money and one pulled out a knife.

He gave the 20 cents he had in his hand to the teen who then stabbed him 14 times with a knife to his upper body, arms, neck and face, inflicting serious injuries and leaving him in hospital until last Friday.

The 15-year-old from St Albans has been remanded in custody to appear at a children's court on January 5.

He was also charged in relation to another armed robbery on November 5.

Police are still looking for the second youth allegedly involved in the Footscray armed robbery.

- AAP