Cesc Fabregas said Chelsea's confidence was returning after they swept aside a barely recognisable Manchester City team, winning 5-1 in the FA Cup.
Chelsea scored four times in the second half as they crushed a youthful visiting side featuring five full debutants in the fifth-round tie at Stamford Bridge.
"You can see straight away we are playing better and better and the confidence once you start winning is growing and growing," Fabregas told the BBC. "We still have to improve. We have big games coming up."
The midfielder claimed City's decision to make wholesale changes did not play into the Blues' hands, though.
"For us it was negative," he said. "It puts pressure on us. The pressure was on us, big time."
Cesc Fabregas has paid tribute to outgoing Chelsea boss Jose Mourinho, thanking the Portuguese for "all you have done for me".
"I owe you a lot and we will all miss you," the Spanish international said.
Chelsea midfielder Cesc Fabregas has called on his team-mates to start earning their money following their poor start to the season.
The west London club currently find themselves struggling in 16th place after 16 matches, including Monday's loss at Leicester.
"We all have to take responsibility. If you are a big player and you are paid like a big player, you must play like a big player and behave like a big player," Fabregas said in a Facebook interview.
"I am not saying you can't have a bad season and bad games. We all have - big players and small players. But the attitude has to always be spot on. We must always be at the top of our games, and the behaviour has to be better than what we are seeing right now from every single Chelsea player."
Cesc Fabregas has tweeted his support for Chelsea manager Jose Mourinho stressing he is "extremely happy" at the club and has an "excellent relationship with the manager".
The Spanish midfielder, who was left out of Mourinho's starting line-up for Saturday's defeat against Liverpool, said:
Cesc Fabregas will only be suspended for one game after having the ban reduced from the original three matches.
The Spaniard was sent off for kicking a ball at a group of players against West Brom on Monday.
Chelsea midfielder Cesc Fabregas was sent off by referee Mike Jones after kicking the ball into a crowd of players.
Jones was trying to deal with a previous foul, when the Spaniard kicked the ball straight at Chris Brunt's head, leaving Jones not choice but to dismiss the striker.
Cesc Fabregas believes Jose Mourinho has an "edge" that goes above any other manager he has worked with in football, including Arsene Wenger.
The Chelsea midfielder woke up on Monday morning celebrating his 28th birthday and a Premier League title victory three games before his debut campaign at Stamford Bridge comes to an end.
It's a dream that Fabregas failed to fulfill during seven seasons under Wenger at Arsenal, and he has singled out Mourinho's winning mentality as a decisive factor in Chelsea's triumphant season.
Speaking to the Daily Mail, the Spanish international said:
Cesc Fabregas wants to follow up Chelsea's Premier League triumph by challenging for the Champions League.
Chelsea's win over Crystal Palace on Sunday saw them win the league, but the Spanish midfielder wants more.
"The Premier League has always been a trophy that I wanted to get in my career. Hopefully it will be the first of many," Fabregas told Chelsea TV.
"I hope the future holds many trophies, many Premier Leagues, Champions Leagues and hopefully we can start building a fantastic team that next year can fight for the Premier League and Champions League.
"It feels great. It's the feeling that I really wanted to get. It's a special moment, a special trophy. The most difficult league in the world, so very proud."
Cesc Fabregas has issued a pointed reminder to Arsenal of the reason why he chose to return to England with Chelsea as the Blues close in on his first Premier League title.
The Spain playmaker made more than 300 appearances for the Gunners in an eight-year spell before leaving for Barcelona with one FA Cup winners' medal to his name after a number of near misses, including in the 2004-2005 Premier League season and 2006 Champions League final.
Arsenal, who host Chelsea on Sunday when victory for the visitors would all-but assure them of the title, had an option to buy-back Fabregas.
It was not taken up and the 27-year-old, who joined the Gunners as a teenager and went on to captain the club, moved to Stamford Bridge in search of one of the few honours to elude him.