Carlo Ancelotti was worried about Celtic’s recent demolition of rivals Rangers.
The Italian manager will want to defend their Champions League trophy and had a bright start to the campaign with a 3-0 win over Celtic.
Real Madrid initially seemed to struggle in the first-half with Callum McGregor hitting the woodwork.
Goals for Vinicius Junior, Luka Modric and Eden Hazard sealed the game in the second half.
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Ancelotti told BT Sport: “It was like two games, first half we suffered a bit with intensity, second half we had control.