Casemiro offered no excuses for Real Madrid's 3-0 loss to Paris Saint-Germain, admitting his team were below their best on Wednesday.
A brace from Angel Di Maria and a late Thomas Meunier goal saw PSG to their comfortable victory in the Group A clash at Parc des Princes.
While Madrid had two goals ruled out, they failed to record a single shot on target in a Champions League game for the first time since Opta started collecting the data in 2003-04.
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Casemiro said there was still time for Madrid to recover, but the midfielder lamented a below-par performance.