Real Madrid v Manchester United: goalkeeper David de Gea over his 'wobbles' insists manager Sir Alex Ferguson He also had to mature physically, but young kids have wobbles, they get up, wobble again, get up and then walk, and the boy is walking now. De Gea's inability to adjust to the more physical demands of English football have raised question marks over his long-term prospects at Old Trafford. But the youngster claims that he has emerged from his troubles as a better goalkeeper. "Of course, when you arrive at a new club and different league, it's normal to have low points," De Gea said. But it's important to learn from those bad moments and I feel I am a better keeper now than when I arrived at United. During his time at Atlético, De Gea conceded eight goals in just three games against Real at the Bernabéu. His most difficult challenge tonight will centre around preventing Cristiano Ronaldo from improving his tally of 182 goals in 179 games for Real and the goalkeeper admits that the former United forward poses the biggest threat to his goal. "I think everyone knows how hard Ronaldo can hit it and how well he can play," De Gea said. It is very hard to defend his shots, but we are here to do this. I will do all in my power to stop him. He is unique, nobody hits the ball so hard, but we will do all in our power to stop him. United are expected to be backed by more than 4,000 supporters inside the Bernabéu, with the same number believed to have travelled to Madrid without tickets. As a result, Spanish police are planning to patrol to Madrid's Barajas Airport throughout the day in order to identify ticketless supporters before that arrive in the city.