Celtic were left hanging last night after their UEFA hearing was postponed.

The club are in the dock on two charges after a flare was let off against Fenerbahce in the Europa League in December while the club were also charged with improper conduct as they collected five bookings in the game.

Ronny Deila’s side finished their Europa League campaign with a 1-1 draw in Turkey but the bookings of Kieran Tierney, Joso Simunovic, Dedryck Boyata, Mikael Lustig and Stefan Johansen landed them in trouble again with the game’s governing body.

Last season Celtic were fined just under £6,000 after they had Virgil van Dijk sent off in a 1-0 defeat in the San Siro against Inter Milan and also had five players cautioned.

However, Hoops assistant John Collins has insisted that there is no way Celtic can be seen as a dirty team.

“That surprises me, that one,” he said. “I don’t think we’re a dirty team at all. Anyone who watches us week in, week out, that’s not something you could label at us. We’re not an overly-aggressive team.”

It is understood that UEFA had a number of cases to hear yesterday meaning that Celtic’s case was kicked on. The club have also been fined eight times in the last five years by UEFA for the use of pyrotechnics at games.

Meanwhile, Collins has also insisted that the change behind the scenes around Celtic’s medical team has strengthened the playing squad.

First-team physio Tim Williamson has taken a back seat as Ronny Deila has brought in his own injury prevention specialists with husband and wife team Bard Over and Grete Homstol implementing a new structure at the club.

Players are not required to report before and after training for physical assessment as sports science takes on a far greater role than ever before at the club.

And Collins believes that the changes have made Celtic a fitter and stronger team.

“Ronny wanted to bring something different to the table,” explained Collins. “He made it bigger, it has grown, and the fruits are now there for everyone to see.

“We had 23 first team squad players on the training pitch today. The results are, so that’s very pleasing. It’s what every club in the world wants.

“There is a different approach, it’s more hands-on. There is lots of work on the muscles. It’s hard, painful stuff for the players every day. The medical staff are stretching them, getting deep into the tissue before and after training.

“They all have programs to do, before and after. It’s preventative stuff. That’s the secret. It’s about keeping them balanced and strong.

“Every player questions change. They ask ‘why, what’s the purpose?’. But you have to go with the flow and thankfully the change has been better. The proof is in the pudding.

“James Forrest hasn’t been injured for a long time, for example.

“The last thing you want is a treatment room full of injured players when you are paying them salaries and they’re not playing.

“The ideal scenario and dream for every club is to have fewer injuries. So we try everything possible, every method, to avoid them.”