Drogba has been squeezed out to accommodate Fernando Torres.
"It was a tough decision but with these kind of strikers it is a normal rotation," Ancelotti told the Daily Mail. "Sometimes you can use both. Sometimes you can use Torres, sometimes you can use Didier. Maybe Didier will play Saturday (against Everton) and Torres will play Tuesday (at Copenhagen). Maybe both will play on Tuesday.
"It is not a problem. I have won a lot of titles but I have put Kaka on the bench, Shevchenko on the bench, and now Didier on the bench. Big scalps!
"The players are always the same. They are not happy to not play. They have difficulty understanding why, even when you try to explain.
"It was difficult for me to understand when I was a player, when Fabio Capello came to me to explain to me why I didn't play. I would listen but I would not agree. It allows me to understand a lot of things when I am a coach. Didier is OK."