The Portuguese boss, who was sacked by the Blues after just nine months in charge, faces the Red Devils for the first time as Spurs manager tomorrow.
"He has a challenge," said Ferguson. "He wasn't at Chelsea very long, but he came to our ground early last season and his team tried to play football.
"That's his philosophy and I think he's carrying that out at Tottenham as well. He suits Spurs. They've always had a history of playing good football. I think he'll carry on that way."
Spurs have collected eight points out of a possible 15 in the Premier League so far.