Arsenal manager Arsene Wenger has once again voiced his concern with the lack of action being taken by footballing authorities over the problem of doping in the sport.

Wenger believes that European governing body, Uefa has not been tough enough against drug cheats after Arsenal's recent Champions League opponents, Dinamo Zagreb, escaped punishment after one of their players failed drug test.

Zagreb's win over the Gunners will be allowed to stand even though Arijan Ademi tested positive for a banned substance after the game.

Uefa's rules allow a result to stand if only one player in a team is caught doping.

Wenger has expressed his surprise with that policy, saying: "I personally don't agree with the rule because you can't say 'oh, they had a doped player so the result stands'. That means you accept basically doping. But it is the rule and we accept that and we have to look at ourselves and deal with our own performance".