The Manchester United boss saw his side beat Tottenham 2-0 in the Barclays Premier League on Saturday to sit five points behind leaders Chelsea and he claimed there was no need to bring any new players to Old Trafford in over the winter.
"We won't be buying in January, definitely not," said Ferguson in the Independent.
"If you want someone to play in Europe, you are limited right away. There are hundreds of players cup-tied.
"You have five months left of the season, I will have Antonio Valencia back hopefully towards the end of February, which is a new player coming back. If Michael Owen gets back, it is another new player coming back. So with the squad I've got, I don't see any reason for us to buy anyone."
Ferguson also revealed Wayne Rooney is not set to return from his ankle injury for another five weeks. "I think Wayne Rooney will be out for another five weeks," he added in the Sunday Express.
"He'll have to pick up his fitness again. I would think five weeks should be about right."