Chelsea defender Filipe Luis believes that his former Atletico Madrid teammate Radamel Falcao has improved as a player since joining Manchester United on loan.

The Colombian international has only found the net once for the Red Devils, but his fellow South American insists that the striker's overall game has developed.

"Falcao is a better striker now than he was at Atletico for sure. He was injured and changed clubs so he wants more. He is not resting right now. He is a tiger and wants to score more," Luis told the London Evening Standard.

"I enjoyed playing alongside him at Atletico for a lot of games. I remember him in the Super Cup, he scored a hat-trick in about 30 minutes [against Chelsea] but he did a lot of good performances in Atletico and had a lot of good seasons there.

"He is a brilliant striker. He fights for every ball and is probably the best in the world with his head. I know it's going to be difficult but not just against Falcao - United have a lot of good players."

United take on Chelsea in the Premier League at Old Trafford tomorrow.