Both teams have a 100 per cent record to date so something must give when Atletico madrid host Liverpool in the Vicente Calderon stadium.
While Liverpool go into the game relaxed and confident after maintaining their unbeaten start to the season, Atletico are under pressure after a third successive Liga defeat, this one against arch-rivals Real Madrid.
“At any club in any league in the world, losing three consecutive league games would cause alarm bells to ring and speculation to begin,” Aguirre said.
“We’re used to this. The team remain in good spirits. The Champions League is a different competition and we want to continue doing well in it. Maybe we’re more concentrated in the Champions League as we haven’t played in this competition for a long time. In our domestic league, maybe we feel we know our opponents too well.”
Unfortunately for Aguirre, striker Sergio Agüero, who has three Group D goals already, will not start because of “muscular pains caused by tiredness”. His place is likely to be taken by former Liverpool forward Florent Sinama Pongolle. Pablo Ibanez is back to full fitness, but Gregory Coupet, Tomas Ujfalusi and Maxi Rodriguez are all out with thigh problems.
Liverpool coach Rafa Benítez has injury troubles too, not least the absence of former Atletico striker Fernando Torres.
“I spoke with the [club] doctor and we agreed that because we have so many important games coming up, it would be better for him to stay in Liverpool,” Benítez said. As well as Torres, Liverpool will be missing centre-back Martin Skrtel (knee) and full-back Philipp Degen (ribs).
Benítez is enjoying a homecoming of his own.
“Until I went to Liverpool, Madrid was always my city, it’s my home town,” he said, adding: “I’ve always had a high opinion of Atlético, my father was an Atlético supporter.”
“We want to win for our fans,” he added. “Getting three points here is all I’m worried about, but if Atlético are playing well and their supporters are right behind them, they will be difficult to beat.”