He was taunted with cries of You don't know what you're doing' when he substituted Joe Cole during the recent draw with Fulham and the side were booed off after being held at home by Southend in the FA Cup last week.
But the Brazilian, who has Alex, Florent Malouda and Jose Bosingwa all available after injury, insist he is not feeling the heat as he faces his first mini- crisis since joining the club. He added: "This is my job. I need to arrive in first position in every competition. If I don't, the board will say if I have done a good job or not. It's not a question of pressure.I work hard and I want to win."
Ferguson, whose team play one of their games in hand against Wigan at Old Trafford next Wednesday, believes that home advantage will make a huge difference in the title race.
Chelsea, Liverpool and Arsenal all have to head to the north-west and United have only dropped points to Newcastle — a 0-0 draw in their opening match — in eight home games.
Ferguson said: "The two games in hand we have gives us an opportunity to close the gap [on leaders Liverpool]. There is no question those are important games and we have to take advantage of them.
"But we need to focus on the challenge of Chelsea first. Our home form this season and record has been great again. Chelsea have always had a good record at Old Trafford. This is a big game and we need to meet the challenge."
Arsenal boss Arsene Wenger, whose team face Bolton tomorrow, would like to see Sunday's match end in stalemate to improve the Gunners' chances of catching the leaders. He said: "Ideally I'd like it to be a 1-1 but we have to focus on our game."
Meanwhile, Ferguson insists he will not change his philosophy of building successful teams without breaking the bank at Old Trafford, unlike the millions ploughed into Chelsea by Roman Abramovich.
He added: "We know we can't match the spending power of Chelsea, who changed the face of the League, and have to identify young players." Ferguson also refused to be drawn on comments from Carlos Tevez that he is unhappy at United's stalling over his contract.