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Uefa regulations permit away teams to practice in the home stadium the evening prior to Champions League encounters.
Diego Simeone's team were engaged in training ahead of their matchup in the league stage of the tournament on Tuesday evening.
At 18:45 BST, the Atletico Madrid personnel informed Arsenal that their dressing room lacked hot water, prompting the Gunners to discover that the same issue existed in their home dressing room.
The squad was scheduled to conclude their training at 19:30 but opted to end 15 minutes early and return to their hotel instead.
Spanish publication Marca reported that the Atletico players were 'upset' with the circumstances.
Arsenal extended their apologies to the Atletico Madrid staff for the trouble that was caused.
Mikel Arteta's squad has secured victories in their first two Champions League matches without allowing any goals.
Atletico faced a 3-2 defeat against Liverpool but bounced back with a convincing 5-1 triumph over Eintracht Frankfurt.

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