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3 July 2013, 11:42 | Updated: 3 July 2013, 11:59
Westley Murray, 33, was dropped at Queens Hospital, Romford, just after 1am on 30th June.
Police are now trying to track the driver of the dark Toyota Prius and two other men who helped the victim inside.
Detectives believe the car may be, or has been, a cab as it has a Transport for London sticker on the back window.
Detective Sergeant Rob Baxter said: "We are trying to piece together Westley's movements in the hours leading to him being stabbed. If anyone knows where he was and who saw him please let us know, you may have vital information about how Westley came to receive his injuries.
"Also I'd ask the driver of the car and the two men who helped at the hospital to get in touch with us, you must have information that can help us track down who was responsible for the attack on Wesley. You took action that may have saved Westley's life but he still needs your help.
"We have found no obvious motive for the attack on Westley. Anyone with any information should contact us on 01708 779 216."
Alternatively contact Crimestoppers anonymously on 0800 555 111