UEFA has launched an investigation into the incident relating a fan running onto the pitch at Celtic Park during the club’s UEFA Champions League fixture with Manchester United.

John Paul Murphy, 19, pleaded guilty in Glasgow to a “breach of peace and being drunk in a sports ground” last Thursday and is currently being held in custody.

The teenager ran onto the pitch in the 35^th minute during the “battle of Britain” tie, causing the game to stop for a short period.

UEFA has sent a number of investigators to compile a report into the incident, which could result in Celtic facing a number of punishments.

Celtic have already been fined before, after receiving a £25,000 fine after Celtic supporter ran onto the pitch to confront AC Milan goalkeeper Dida, of which half was suspended. The Scottish champions were warned that the rest of the fine would be put in force should the club fail to control their fans in future, which seems likely to be triggered.

Celtic could also face punishments such as playing their competitive games behind closed doors or at a neutral venue, or having points docked.