Johansson, who is aiming to win re-election ahead of French legend Michel Platini next January, said that behaviour on the pitch is a "crucial issue" for the game and has warned players to improve their on-field conduct.

A case in point, he said, was the Barcelona v Chelsea Champions League match in midweek.

Johansson repeated that both clubs should face a disciplinary investigation following their match, despite neither the referee nor match delegate recommending any action be taken.

A UEFA spokesman has admitted that an investigation could still be launched into the conduct of both clubs.

In an interview with the Press Association, Johansson said: "On the crucial issue of behaviour in the game I do think there were issues at the recent Barcelona v Chelsea match which will need to be looked at by the UEFA disciplinary bodies in relation to both clubs.

"It's a matter for the UEFA disciplinary process, not for me personally, but I do want to emphasise the importance of good standards of behaviour and proper conduct in the game.

"This applies to every club, coach and player and it's not my intention to single out any individual.

"Like many in the game I think improving standards of conduct is an important issue which must not be dependent on the disciplinary process."