As the January transfer window looms, Sir Alex has reiterated his belief that his current squad is good enough to cope with the rigours of what promises to be an absorbing title race.
But while the Reds boss has no plans to dip into the transfer market, he insists he's both willing and able to spend money should circumstances change over the festive break.
Some sections of the press and, indeed, the Old Trafford faithful have implored Sir Alex to strengthen during January, calls that grew in volume following United's recent exits from both the Carling Cup and Champions League competitions.
"All things being equal, I am perfectly happy with the strength of our squad in terms of depth, quality and age range," Sir Alex writes in his Boxing Day notes in matchday programme United Review.
"I will not be swayed by the endless tweets and blogs urging the club to get busy in the transfer market next month.
"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 - that's the football world. 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.