He said: “I can only echo what the club and the supporters’ associations are saying – that, first and foremost, from a serious safety point of view, this sort of thing is not something you want to see.
“I’ve been to so many Celtic games, both as a player and as a fan, and there’s nothing better than the Celtic support when we all get together and get behind the team.
“One of the best experiences I ever had was the night we beat Barcelona back in 2012, the night after we celebrated our 125th anniversary.
“It is a very small minority, but, unfortunately, they’re not realising what their actions are bringing to a support which has gained a worldwide reputation for going to so many different places and so many different grounds, and for receiving awards for being the best fans in the world.
“People know that these pyrotechnics are banned – you’re not allowed to take them into a football game – so surely they would see sense and realise that’s not the way to make a good atmosphere.