The centre-back was not impressed with the match official\'s display in the game against Valencia, and expects a difficult encounter versus Atletico Madrid on Wednesday.Real Madrid defender Raul Albiol has hit out at referee Clos Gomez in the wake of Los Blancos\' scoreless draw against Valencia at the Santiago Bernabeu in La Liga.Madrid failed to break through the Valencia defence in Sunday evening\'s encounter and consequently had to settle for a draw, and Albiol was quick to point at the referee as one of the main reasons for their slip up.\"There were a few controversial moments in the match, such as a penalty on [Cristiano] Ronaldo. The referee didn\'t give his best performance and the crowd was angry at him,\" Albiol was quoted as saying on the club\'s official website.The centre-back then looked ahead to Wednesday\'s Primera Division match away against Atletico Madrid, and expects a difficult encounter in the derby.\"This week will be tough. We expect Atletico Madrid to be aggressive and motivated to win. We\'re going to concentrate hard to take three points.\"We have to win at the Vicente Calderon after drawing against Valencia. We do our best to win on every ground.\"Real Madrid remain first in the Liga table, but their lead over rivals Barcelona has been slashed to just four points.