Inter Milan coach Roberto Mancini wants the club to be careful with their January buying.

Mancini says unless its Real Madrid star Cristiano Ronaldo or Barcelona's Lionel Messi, any new addition could prove disruptive.

"I read that we are buying everyone and I'm glad," laughed Mancini.

"We have to improve the set with the players we have. If we have to take someone, they must make the difference immediately and do not need 2-3 months of acclimatization.

"At the moment we have not talked about players. When you work with a group you create something that is not easy to put a new player in unless it is Messi or Cristiano Ronaldo.

"We need someone who knows Italian football and the environment."