Pep Guardiola expressed huge reservations over any closed-shop competitions that remove the relationship "between effort and success" after plans for a European Super League were announced on Sunday.

The Manchester City boss insisted he needed more information about the tournament before making a full judgement, but admitted he was against the concept of a format that involved hand-picked clubs and no open means of qualification for other teams.

City are one of the six Premier League sides to have signed up to the continental breakaway league, which has attracted a deluge of criticism from across the sport and beyond.

Speaking ahead of City's top-flight clash with Aston Villa on Wednesday, Guardiola faced questioning over a development that has dominated the headlines since being made public.

"Sport is not a sport when the relation between the effort and reward doesn't exist," he said. 

"It's not sport when success is guaranteed, when it doesn't matter if you lose. I want the best competitions as strong as possible. In this statement, it's what I feel. This is not sport."