The Scottish coach stated that both Tottenham and Arsenal could be in the running despite not winning a match as yet, and that pressure from Chelsea, Liverpool and Manchester City will make it difficult for his side to retain their place on top of the standings.
“I think you could say that five or six teams will be involved,” he said on Sky Sports News.
“It’s always hard to win the league. In the south, you have the London teams like Arsenal, Tottenham and Chelsea and then you have ourselves, Manchester City and Liverpool in the north.
“It’s a really, really difficult league to win,” he continued.
The United legend, who will have been in the Old Trafford hotseat for 25 years come November, also defended Real Madrid boss Jose Mourinho, who has been chastised in the Spanish press recently for his over exuberant nature from the sidelines.
“I don’t find anything wrong with his enthusiasm. When I was younger I showed more enthusiasm on the bench too. I was always gesticulating and directing. It’s Mourinho’s nature to be agitated,” he concluded.