Nani is aiming to be the Christmas No 1 as United prepare for back-to-back blockbuster clashes in the Premier League. The Reds hope to throw down a title challenge with successes against London big guns Arsenal and Chelsea. League leaders Arsenal are a point ahead of the Reds and visit Old Trafford next Monday. United then travel to the capital for a showdown with champions Chelsea in their last match before Christmas a week on Sunday at Stamford Bridge. And Portuguese winger Nani believes United have a chance to send a message to their rivals. If we win against Arsenal and Chelsea we will be in a very good position to win the league. It will be a fantastic position to be in, said the 23-year-old. Our momentum is growing. Everyone is starting to play fantastic again, like Wayne Rooney and Anderson. Our performances are growing. That is great because our next two games are going to be very important for us. Arsene Wenger's side hit the front last weekend and moved a point ahead of United with victory against Fulham, taking advantage of the Reds' postponed match at Blackpool. Meanwhile, Chelsea lost ground, drawing at home to Everton, and the title holders and early season pacesetters are now third and a point behind United. Arsenal have been doing well, added Nani. They are growing up in the way we are. They are a good team. I think they are a bigger threat than Chelsea now. Chelsea have lost a few games and drawn some and their confidence looks a bit low. But Arsenal have been winning and being top of the league gives you great confidence. They also have an in-form player in Sami Nasri. He is a big danger and we have to take care of him on Monday. But I like to play against Arsenal. I have had some very good games against them. The way they play gives you a chance to show your quality. The big matches bring out the best in me.