Chelsea goalkeeper Petr Cech believes Carlo Ancelotti's side are now Manchester United's main challengers in the race for the Barclays Premier League title.
The Blues leapfrogged Arsenal into second place in the table on goal difference after last night's 3-1 victory over Birmingham City at Stamford Bridge.
Meanwhile, the Gunners were pegged back from a two-goal advantage to draw 3-3 with North London rivals Tottenham Hotspur at White Hart Lane, in a thrilling derby encounter.
Both Chelsea and Arsenal trail leaders United by six points, with five games left to play. But Cech feels that the in-form Blues are better positioned to make a realistic push for the domestic crown.
"Arsenal have difficult games and United have to play us and Arsenal so there could possibly be six points [lost for them].
"We have two games at home against West Ham and Spurs to come and if we win both, the situation could change again."
Chelsea's return to form, which has seen them win six of their last seven league games, has put Ancelotti's side in genuine contention once again, having previously been written off for the title.
"We've been saying for a long time we want to keep winning and maintain the pressure on everybody.
"Chelsea were one of the worst [teams in form] a few months ago and now we're getting back to normal."
And the fact that the Blues have no other distractions other than the focus of retaining the title, Cech feels the situation could play into their hands.
"We have one competition to focus on which is to our advantage because we can prepare all week and get more rest.
"Everything is close and it is important to score goals. We could end up with the same number of points, so goal difference will play a big part now."