Liverpool manager Rafael Benitez and Chelsea counterpart Guus Hiddink have vowed to keep pushing Manchester United for the Premier League title.
Both won on Tuesday and are four points behind United, who have two games in hand and face Newcastle on Wednesday.
Liverpool visit United on 14 March and Benitez said: "If we win that, things may well be a lot different."
Hiddink said: "It is good for everyone in this championship to keep the pressure on the number one team."
Chelsea won 1-0 at Portsmouth and Liverpool beat Sunderland 2-0 to cling on to their title hopes.
Hiddink delighted with 'hard-working' win
"United are in a good position," added Benitez. "United have experience but clearly it's important for us to win.
"Chelsea won too so United have to win if they want to keep the difference."
Benitez, whose team face Real Madrid in the Champions League on Tuesday, will take his side to Old Trafford on the back of a confidence-boosting win over Sunderland, which followed Saturday's defeat by Middlesbrough.
"This win has lifted everyone's spirits after the bad defeat at the weekend," stated Benitez.
"We needed a win. The team needed to show character and that is what they produced."
Hiddink has enjoyed three league wins and a Champions League victory over Juventus since taking over as Blues boss and has sensed a strong desire in his players.
"United have games in hand and they have a buffer," he said.
"They are an experienced team but that is why it is good that we keep on winning. It keeps the pressure on.
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