Guus Hiddink has vowed to push Manchester United to the "bitter end" in the Barclays Premier League title race and also wants to guide Chelsea to Champions League glory.
The Dutchman has guided the club to four league wins on the spin to put them within four points of Manchester United. United's rivals have been encouraged by Liverpool's win at Old Trafford, although Sir Alex Ferguson's men remain in the driving seat with a game in hand.
Hiddink told Russian newspaper Sovetski Sport: "That is the task we are facing but, objectively speaking, it will be extremely difficult to achieve."
He added: "Don't forget that Manchester have a game in hand and, moreover, they have a lot of experience of winning the league. All I can promise is that Chelsea will fight to the bitter end.
"You perfectly know my way - work, work and more work. That has been the principle since my first day in London. So far, so good.
"We started in fourth place in the Premier League, now we are second."
Hiddink feels his side will also look to go one better than last season when they lost the Champions League final on penalties.
"We are in the best eight clubs in Europe and each of them harbours ambitious plans. Chelsea are no exception," he said.
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