Atletico Madrid coach Diego Simeone admits he's fortunate to work with Radamel Falcao.

For many, including Simeone, the Colombian is the best striker in the world.

Chelsea are chasing Falcao, with Real Madrid vice-president Jose Angel Sanchez having made contact with his agent, Jorge Mendes, this week to register their interest.

"Falcao is probably the best No9 in the world right now," enthused Simeone.