Open Extended ReactionsReal Madrid goalkeeper Thibaut Courtois is very impressed by Trent Alexander-Arnold's "unbelievable" crossing ability and described his new teammate as a "nightmare" for goalkeepers. "He could have provided several assists already in the tournament," Courtois said of the former Liverpool full-back. He has started in all of Madrid's games at the Club World Cup so far playing as a right-back and in midfield. Madrid will take on Borussia Dortmund in Sunday's Club World Cup quarterfinal in New Jersey. Asked what he thought about the level of South American teams, Courtois said: "We who know football never doubted their level.