The man was walking in Whittleford Park on Wednesday 5 January when he was assaulted.
The 18-year-old victim was walking near the lake around 4.50 pm on the 5th of January when he was approached by a teenage girl.
When she asked the man a question a group of around seven other teenage boys are reported to have joined her and assaulted him.
He sustained facial injuries, back injuries, cuts and bruises as well as injuries to his hand – none of which are believed to be life-threatening at this time.
The gang took tobacco and cigarette papers from him whilst unsuccessfully trying to take his phone.
The group of seven boys and one girl, who are thought to be around 15 or 16 years old, were all white and wearing dark coloured tracksuits.
Warwickshire Police want to speak to anyone who has information or may have been in the area at the time of the incident.