 This unusual tradition survived until 1994, although numbered shirts were worn in European competition from 1975 onwards.Celtic's tradition of wearing numbers on their shorts rather than on the back of their shirts was brought to an end when the Scottish Football League instructed Celtic to wear numbers on their shirts from the start of the 1994–95 season.Celtic responded by adding numbers to the top of their sleeves, however within a few weeks the football authorities ordered the club to attach them to the back of their shirts, where they appeared on a large white patch, breaking up the green and white hoops.