Arsenal boss Arsene Wenger isn't satisfied with the level of testing being done to catch dopers in football, and has called for blood testing to be the norm as the sport moves forward.
Wenger had been asked to explain his recent comments on doping to the Football Association. In a recent interview with L'Equipe Sport and Style, Wenger said he had never instructed one of his players to take a performance-enhancing substance, but suggested he had come up against opposition who may have done so.
Speaking to BeIN Sports on Monday, the Frenchman said more needs to be done to ensure there's no doping in football.
"I'm not satisfied with the level of testing because I believe blood tests should be done," Wenger said in an interview. "If you want to go into a bit more sophistication you have to do blood checks. Urine checks are superficial and not deep enough to say absolutely sure that we have no doping problem in football.
"I think no [we don't have a problem] and I wish no but on the other hand, can you have 740 football players at a World Cup and come out with zero alert on any doping? It's a little bit surprising. I hope it is true but I think to be completely sure about it, you want to go into deeper tests."
Wenger fears current controls are not enough from dissuading potential abusers from doping.
"Look, you have to come to the facts," he said. "There are two reasons why a player is doped. First, on personal initiative. That means he hides to his club that he doped because he's scared to lose his place, because he wants to impress, because he has an individual or personal reason to enhance his performance.
"Or it is organised by the club to dope some players and enhance the performances because they are not ready or not good enough or because they have a special competition.
"In most cases, I think, you have to make the player feel responsible for the club as well."
Wenger said clubs must take the initiative, adding: "That means, he cannot be only punished if he's guilty of having doped because it's too difficult to prove that it's a club initiative or a personal initiative so the clubs have to be responsible for the doping of the players individually as well and tell them before the season starts, 'look, for any doping control, your contract is completely finished because the club suffers the consequences.'"
Dinamo Zagreb midfielder Arijan Ademi failed a drugs test following the Croatian side's victory over Arsenal in the Champions League earlier this season, which has forced Wenger to further question the current standards.
"For example, now you have three doping tests after the game. If one of the players is doped, the result of the game is not changed. You need two to be doped to have a result of the game changed but if you test only three, it is nearly impossible that you catch a second one," Wenger said.
"Out of 18, it means you test as well the players who have not played, so you can say there is something in there that is not completely logical and maybe we have to do more. I hope it is not a deep problem and I don't think it is one. I don't think in England, in the Premier League, I don't see any signs of doping at all."
The Frenchman concluded: "UEFA's handling of the situation is according to the rules. I'm not unhappy with the handling of the situation by UEFA. I am more questioning the rules that exist and are maybe not good enough."