Detectives issued the photo of 27-year-old Jamil Ahmed’s injuries following the assault in the hope it will persuade someone to speak out.
The restaurant worker was walking along Ladypool Road, Sparkbrook, when he was set upon by three people in masks.
Jamil, from Sparkbrook, needed hospital treatment for more than two weeks before finally being discharged on New Year’s Eve.
A police investigation has so far been unable to identify those responsible or confirm a motive for the beating.
Jamil, pictured, who’s been unable to return to his job because of his injuries, was in Ladypool Road at about 6pm on December 15 when the attack happened.
A police trawl of local CCTV cameras reveals one offender wearing a black face covering, gloves, a long-sleeved grey top, and grey Adidas tracksuit bottoms with light blue stripes on the side of the legs.
Anyone with information is asked to call Det Con Akers on 101 or Crimestoppers anonymously on 0800 555 111.