The Blues legend has returned to Stamford Bridge on a one-year contract but, despite his advancing age, the captain says that the Ivorian striker remains a "nightmare" opponent.
Two years after winning the Champions League and departing the Blues, the Ivorian signed a one-year contract in July following his exit from Galatasaray and his captain says that he is as dangerous an opponent as ever.
Though Drogba is now 36, Terry sees him as a huge asset to the club, both on the pitch and in the dressing room as an influence for Jose Mourinho's younger players.
"Didier's still the same. He's been a nightmare to play against in training. He's still physically strong, sharp and hungry as well," Terry told Chelsea's official website. "It's important Didier is here because he brings that mentality of wanting to win every day and that rubs off on people like Kurt Zouma and the other young players he's playing against."
It has been a transfer window of great change for Chelsea, which - in addition to Drogba and Diego Costa - haa recruited Cesc Fabregas and Filipe Luis.
Meanwhile, long-serving players Ashley Cole and Frank Lampard have moved on, with the latter set to play for Manchester City on loan after joining affiliate Major League Soccer franchise New York City, but, while Terry is saddened by the departures of the iconic pair, he feels that fans should be excited by the club's future.
"It just doesn't seem right to see them [Cole and Lampard] in different shirts," the skipper admitted. "The club are evolving. One day we'll all be gone.
"It's time for these players to continue to keep winning trophies for this club and keep the fans and owner happy.
"If I was a Chelsea fan I'd be impressed from what I have seen so far from Diego [Costa], Cesc [Fabregas], Filipe [Luis] and all the boys that have come in like Kurt as well."