Many Western and British media have confirmed that Atletico Madrid has filed a formal complaint with UEFA due to the lack of hot water in the locker room during training at Arsenal's home Emirates Stadium yesterday.

It is understood that Arsenal restored the hot water supply about 40 minutes after Atletico reported the problem. Atletico Madrid originally planned to end training at 19:30, but ended the training 15 minutes early and took the bus back to the hotel.

Simeone's team was confused and angry that a world-class stadium like the Emirates Stadium lacked such basic facilities, and filed a formal complaint with UEFA.

However, the British media talkSPORT pointed out that this incident is unlikely to be planned by Arsenal, and it is unlikely that they will receive any official punishment for this.

The reason is that although the need to provide hot water in the locker room is one of UEFA's requirements for stadium infrastructure, this requirement only applies to matches, not pre-match training.