Jose Mourinho's side are unbeaten in all competitions this season, and Drogba believes that the legacy left by the Portuguese coach in his first spell at the club can still be seen now.
"I think Chelsea will always be at this level because of what the players before created," the Ivorian told reporters. "The habit of wining trophies, winning big games and being in the last four and the finals.
"This is a good habit. Even when we stop, I think Chelsea will continue this because this is a kind of legacy.
"That's why I say this club is very special, because in the first season we had to win. The first season we had to win. We had big expectations from the start. That's the legacy I was talking about earlier. You have to win at this club. This team has different strengths. Different qualities, but it is still as strong and as good as the previous ones."
Chelsea travel to Old Trafford to meet Manchester United on Sunday.