Rooney left Manchester United as the club's record goal-scorer after surpassing Sir Bobby Charlton's tally of 249 during his final season at Old Trafford.
"They understand that from time to time when you move from certain areas, and certain eras as well, you have to change things and I think Mourinho has changed over the years because his management style was demanding, asking for full control".
"I think Rooney will find a way to score, I'm scared for United that he can find different ways", Saha told BetStars.
It's that power to resist financial overtures of other clubs that has transformed the landscape of the Premier League in Mourinho's view.
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The Blues' £60m addition from Real Madrid has scored three times and created two more goals so far in the Premier League.
Ibrahimovic, who is recovering from cruciate knee ligament damage, is likely to play a significant part in the second half of the season after signing a new one-year contract in August, offering Lukaku competition for his place in United's attack.
It's not just about the striker, said Mourinho. "It is the most hard country in which to win the title".
But I think he also deserves credit for that because of the way he plays, the way he is committed, what he does with and without the ball, not just the last touch and the goal but his overall contribution.
So life goes on, and that's the way I did it last season with Fellaini.
"You just have to respect the player's desire, and what they decide. I am not going to do that".