An unprovoked assault outside a Douglas pub on Saturday night is being probed by police.
It occurred just before midnight at the British on the quay where the victim was standing when he was approached by a group of men.
Police are appealing for witnesses and say one of those involved is around 18 years-old who allegedly punched the victim to the side of his head.
He was wearing a black T shirt and dark coloured tracksuit bottoms.
The group of men ran off before police arrived.
If you have any information, the number to call 631212 - PC Dave Kneen or any other officer.
Manx Care interim operations director to leave next month
Almost 38,000 passengers used ferry services to travel to Island during TT
Cyclists from visiting cruise ship exploring Island
Decision over Peel telegraph poles "should still stand", says minister
43 babies born on Island in May