Manchester United manager Sir Alex Ferguson will not be forced by public opinion into making rash buys in the January transfer window. Ashley Young has joined an extensive injury list that includes the likes of Nemanja Vidic, Anderson, Michael Owen and Tom Cleverley, while Darren Fletcher is also sidelined with a bowel condition. But the United manager, writing in his programme notes for Monday's Premier League game against Wigan, said: "All things being equal I am perfectly happy with the strength of our squad. "I will not be swayed by the endless tweets and blogs urging the club to get busy in the transfer market. "As far as I am concerned I am marching perfectly in step, true to my beliefs and principles. "While recruiting some of the world's leading players can lift you into contention for honours, it doesn't necessarily take you all the way, as I hope we will be able to demonstrate before the end of the season as other factors come into play. "You can never say never in football, of course, because fortunes can fluctuate wildly. If a really top-class player became available, then we would go for him, or if we picked up any further serious injuries, it might be important to add to our squad."