Atletico are "furious" after finding the dressing room lacked hot water for their showers.
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Atleti players trained on the Emirates pitch on Monday night in preparation for tonight's tie and were left "shocked" to discover the away dressing room's showers lacked hot water.
The Sun says Atleti officials alerted Arsenal to the situation at 6:45pm, with the players already on the pitch. The hot water was flowing by 7:25pm, but Atletico had already left the stadium by then and decided to shower at the team hotel.
Arsenal have since apologised to Atletico, but the complaint has still been lodged with UEFA.