Ancelotti brought Torres to Stamford Bridge for £50m last January but he claims that the Spanish international would benefit from Drogba being sold.
Various clubs have been linked with a move for Drogba in the January transfer window.
The Paris Saint-Germain boss said: "Take Torres and his crisis - if you decide to invest heavily in him, you have to sell Drogba.
"Didier is like Filippo Inzaghi at AC Milan. He tends to devour whoever is in competition with him. It's not maliciousness, players are made like that."
Chelsea are currently fourth in the Premier League.