Manchester City midfielder Yaya Toure admits he cannot believe that his side have been given another chance of winning the Premier League title.
Sunday's results blew the title race wide open after City beat Wolves 2-0 following United's shock 4-4 draw with Everton after being 4-2 up.
It means the gap between first and second is down to just three points - a margin that City will close if they beat their city rivals at the Etihad Stadium next Monday, live on Sky Sports 1 HD.
Roberto Mancini's side were eight points behind just a few weeks ago but their wins against West Brom, Norwich and Wolves have put the pressure on Sir Alex Ferguson's men, who have won one of their last three.
Toure admits his side need to capitalise on being given a lifeline and revealed that he was amazed by Everton claiming a draw.
He said: "United's result was amazing. It was an unbelievable day for us with United dropping points at home. For me, it was strange.
"We found out about it on the bus on the way to Wolves. It was quite unbelievable and we now have to try and take advantage.
"We did the first part by beating Wolves but we have to settle down and continue to work hard because United still have three points more than us.
"We have to play them at home and, if you look at the record of United, they are very strong away and it will be a very difficult test for us.
"I think this year the club need to win the cup (title) and it will be difficult.
"But we need to win this derby because it will be one of the most important games the club have had."
Toure believes that his team-mates need to cope with the pressure of catching-up with Manchester United in the title race.
But the Ivorian has suggested that the quality within the Manchester City team will help his side to progress through the tight games.
He said: "People say we looked nervous at stages of the game and we have a lot of young players and not so many experienced ones.
"When your big rivals drop points at home, and you have to win your game, it is quite difficult.
"But with the players we have, it can make the difference all of the time with the likes of Aguero, Tevez and Nasri, and we did the job."
While Monday's derby is being billed as the decider, there will still be key games to follow for both clubs.
Manchester City have to go to Newcastle and host QPR, while Manchester United's game at home to Swansea is followed by a trip to Sunderland.
Toure has acknowledged the number of possibilities that can follow the Manchester derby, regardless of the result in that game.
He said: "They are very difficult games to come. We have United, then Newcastle who are playing well at home.
"These games will be very tough until the end of the season, and QPR are playing well as well.
"But, with the team we have, if we win something this year it will be fantastic for us."
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