Officers were called to Pavilion Road at about 8.30pm after reports of a crash involving a car and a pedestrian.
Police said two men got out of the vehicle and attacked a man before running off.
The 21-year-old victim, from Essex, was rushed to hospital where he remains fully conscious and under police guard, a police spokesman said.
Officers have identified two men they wish to speak to following the attack. The investigation is ongoing and enquiries are continuing today.
Anyone with any information is asked to contact 101 quoting reference 139 27/01.
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