John Murphy, 18, was also banned from attending national or international football matches for five years, one of the longest such banning orders imposed in Scotland.

Play had to be temporarily stopped during the first half when Murphy, from Glasgow, went on to the pitch during the clash at Celtic Park on November 5.

Celtic fan Murphy, of Glenavon Road, Glasgow, admitted charges of breaching the peace and being drunk in a sports ground when he appeared at Glasgow Sheriff Court earlier this month.

Last Thursday, Celtic were fined £42,430 by UEFA for the invasion and for the late start to the game, which ended 1-1.

Sentencing Murphy on Friday, Sheriff Linda Ruxton branded his behaviour "dangerous and irresponsible".

She said: "Not only did you create a situation in which there were fears for the safety of the players on the pitch, but you interrupted a high profile match and created a situation which might easily have provoked serious public disorder.

"Furthermore, you brought Scottish football generally and Celtic Football Club in particular into disrepute and your behaviour caused the club to be fined a substantial amount."

She said she would have detained him for nine months but in view of his guilty plea she reduced it to six months.

She also imposed a football banning order which bars him from attending any regulated football match in the UK or abroad for five years.

She said: "Such a sentence is particularly designed to have a deterrent effect on others who need to appreciate that such behaviour at football matches will not be tolerated by the courts."

She admonished him on the drunkenness charge.