But he warned the fans need to be patient.
The 56-year-old Scot told the Mirror: “It is a tough job. You have seen how tough it has been for myself, Louis van Gaal and Jose Mourinho – very experienced managers have found it difficult.
“I think it will be another tough season for Ole, but he is trying to do everything to get it right. I hope he is successful. But there are massive expectations.
“When you become Manchester United manager you are expected to win every game. And when you win the game, you are expected to have done it with style. Then when you win, you are expected to have scored plenty of goals as well.
“Ole will be aware of that and know he has to do well.
“They have now chosen to sign some young players, and when you look back they signed Wayne Rooney from us at Everton aged 18. Cristiano Ronaldo was also 18 when he joined, so over the years they have had a policy of signing young players and many of them have been the best up-and-coming future stars.
“I think Man United just need to follow their values of old."