"He's sharp, he's powerful, he believes in his heart," Jose Mourinho told reporters after his side climbed to second in the table, two points behind leaders Arsenal, the team they meet in the fourth round of the Capital One (League) Cup on Tuesday.
"Since I arrived, since the first day, he has worked very, very hard. Sometimes he was on the bench, sometimes he was not selected, sometimes I left him at home and every day it was the same - so credit to him."
Fernando Torres has been in sparkling form of late and also struck twice in the midweek 3-0 victory at Schalke 04 in the Champions League.
A constant menace against City, he created the first goal when he tore past defender Gael Clichy on the right before crossing for German international Andre Schuerrle to execute a simple close range tap-in for his first Chelsea F.C. goal in the 33rd minute.
Sergio Aguero equalised with a fierce effort just after halftime but Fernando Torres then grabbed his opening Premier League goal of the season in dramatic style when he pounced on a mix-up between defender Matija Nastasic and goalkeeper Joe Hart.
Nastasic, facing his own goal, headed the ball beyond Hart and the Spaniard beat City centre back Martin Demichelis in a sprint before poking it into an empty net in the 90th minute.
Jose Mourinho praised Fernando Torres for keeping his head up despite missing an easy chance to score in the first half.
The Spaniard, who has often struggled since joining Chelsea F.C. from Liverpool in January 2011, evoked memories of his halcyon days at Anfield when he spun sharply on the edge of the box and curled a fizzing shot against the City woodwork in the opening half.
"It was a fantastic performance by him and even better because there was an easy chance missed and that makes it even more valuable because many times when a striker misses an easy chance he is affected for the rest of the game," said Jose Mourinho.
"That was the moment when he decided he would be the man of the match. The fans were amazing and supported him a lot, they see the way he works for the team."
Jose Mourinho refused to take the credit for Fernando Torres' improvement this season.
"We have done nothing with Fernando," said the Chelsea F.C. manager. "It would be easy for me to say that but he deserves credit.
"We work with our methodology and we believe it improves players in terms of sharpness and speed."