Real Madrid manager Carlo Ancelotti anticipates other teams across the continent struggling at Celtic Park despite their comfortable 3-0 Champions League victory.
Los Blancos were up against it in the first half against Ange Postecoglou's men, with Callum McGregor cracking the post and Liel Abada missing two big chances. Daizen Maeda then missed another after half-time which was soon punished with the tournament holders registering three points via Vinicius Junior, Luka Modric and Eden Hazard goals.
Ancelotti says his side weren't at their best in the first half and so good was the atmosphere from Parkhead's stands, the Italian believes it will be a problem for rivals, with Shakhtar Donetsk and RB Leipzig still to visit in Group F. He told BT Sport: "It was like two games, first half we suffered a bit with intensity, second half we had control. We were not surprised [with Celtic's start].