Manchester United striker Louis Saha insists they can overhaul Chelsea and snatch the Premiership title.
Saha and Van Nistelrooy fired Man Utd closer to Chelsea
Saha scored in United's 2-1 win at Bolton that put them within seven points of long-time leaders Chelsea.
He said: "This is a massive win for us and now we have to keep putting the pressure on. We definitely believe it is on. We believe we can do it.
"Chelsea have got to make mistakes, we know that, and we have to keep playing the way that we are."
United make the trip to face Chelsea at Stamford Bridge on 29 April.
And Saha added: "We know that we can not make mistakes. But I am in the best form of my life and was really happy to get another goal, and the way we are playing up front - with Ruud van Nistelrooy as well - is all working well.
"We are in great form and have to keep it going."
United boss Sir Alex Ferguson is also beginning to feel that Chelsea could be caught, saying: "I think it is asking Chelsea a question. Everyone expected them to beat Birmingham, but they didn't.
"And they have got to play Bolton in a couple of weeks when the pitch will be worse than against us, and they have to go to Blackburn.
"If your form is good in April then you have a good chance - I've said that for years. If your form is stuttering then you can throw things away.
"We're catching Chelsea but we just hope the winning line doesn't come too quickly."
Arsenal boss Arsene Wenger, who takes his team to Old Trafford next week, also joined in the mind games by offering assistance to Chelsea as they fight off the challenge from his old adversary Ferguson.
He said: "If Roman Abramovich calls me, maybe we can help him next Sunday. I don't mind who out of Chelsea or United win the league - really I don't."