A 17-year-old girl was choked and had her purse stolen at a party in Footscray last month.

The teenager told police she attended a party on the Maribyrnong River, near Joseph Street, on December 12, a police spokeswoman said.

Police would like to speak to this man, about an assault and robbery in Footscray.

About 12.30am a number of unknown people gate-crashed the party.

The 17-year-old was choked "from behind by an unknown person and had her purse stolen", the spokeswoman said.

She said the man used the victim's stolen credit card at a nearby service station on Whitehall Street, a short time after the attack. He was wearing a red basketball top and a red Ferrari cap.

Anyone with any information is urged to contact Crime Stoppers on 1800 333 000.