Ancelotti played down his team's flying start to the season, which has seen them open up an early four-point lead over perennial title rivals Manchester United.
"It means nothing," Ancelotti said. "We've started better than Manchester United, but it will be a long race. I said last year that the race is only decided at the end of the season. I will say the same this year."
Manchester United missed the chance to keep the pressure on Chelsea after Everton scored twice in stoppage time to scramble a 3-3 draw against Sir Alex Ferguson's men in Saturday's early game at Goodison Park.
"Football can do that to you," Ferguson said. "In a game of a completely comfortable position we've thrown it away - simple as that. We had chances to bury Everton and we didn't do it."
Arsenal stayed in touch at the top with a 4-1 rout of 10-man Bolton at the Emirates, with summer signings Laurent Koscielny and Marouane Chamakh both getting on the scoresheet for Arsene Wenger's side.
Wenger meanwhile said Arsenal's refusal to be unsettled by a physical Bolton team was proof of his team's growing resilience.
"We have had two games, at Blackburn and today, which we certainly would not have taken six points from two years ago," Wenger said. "The players can handle these situations."
City boss Mancini refused to blame Hart for his blunder.
"This is a fluke, it can happen in football but I hope after today we finish making gifts to the opponent. It can happen. Joe Hart is a good goalkeeper," Mancini stressed.
Blackpool earned their second victory of the season -- and second away from home -- with a 2-0 defeat of Newcastle at St James Park.
Ghanaian international Asamoah Gyan saw his Sunderland career get off to a dream start as he rose from the substitutes bench to rifle in the opener at Wigan before Antolin Alcaraz earned a 1-1 draw for the home side.
Tottenham handed new signing Rafael van der Vaart a debut at the Hawthorns but were held 1-1 by West Bromwich Albion. Luka Modric put Spurs 1-0 up but departed injured after 32 minutes before Chris Brunt levelled for the Baggies.
The Cottagers were rocked by a 10th-minute goal from Wolves defender Jelle Van Damme before Belgian forward Dembele struck in the 49th and 90th minutes to give Mark Hughes team their first win of the season.
However, Fulham's joy was tempered by a broken leg suffered by Bobby Zamora which could keep the England striker sidelined for up to four months.
Source: AFP Global Edition