John Fleming and Daniel Hamilton had travelled to the city on March 2, and had been out drinking in the town when they attacked innocent victim Rafal Rybicki.
Fleming, 19, repeatedly punched Mr Rybicki on the head and body to his injury, and Hamilton, 21, repeatedly punched and kicked Mr Rybicki on the head and body to his injury.
The pair appeared at Aberdeen Sheriff Court where they pleaded guilty to carrying out the vicious attack at the city’s Regent Quay.