The 26-year-old Colombia international has scored 10 goals in as many matches in La Liga this season and has been linked with a move to Real since the summer.
"Radamel Falcao is an excellent talent," Kaka told Lance!. "He is also a great friend of mine and I often meet with him in Madrid.
"Our families are friends and I hope that remains for a long time."
Falcao joined Atletico from Porto in the summer of 2011 and helped the Spanish club win the Europa League last season.