But the former Real Madrid manager has since added extra spice to Monday's clash by saying Moyes should shoulder the blame for Rooney's desire to leave Old Trafford after suggesting he was a second-choice striker.
"We are trying to get a player that a manager told 'You will be a second option' for him," said Mourinho.
When asked if Moyes should take the blame, he replied: "Of course."
With or without Rooney, the Portuguese says he will have enough to contend with when he takes on the the reigning Premier League champions, even though Sir Alex Ferguson is no longer at the helm.
"In my first time at Chelsea, they had Roy Keane, [Paul] Scholes, players with big history there," he said. "Now they still have players from my time, like [Rio] Ferdinand, [Nemanja] Vidic, [Ryan] Giggs, and they have a mix with very good young players.
"With that winning culture, that makes the basis of big clubs. And they are a big club for many, many years. They have everything."
Mourinho, who won twice at United in his first spell in charge at Chelsea, said his
special relationship with Ferguson
has remained strong during his six years away from England.
I'm here to win trophies - Moyes
"In the same way he told me he was going to retire and I kept secret on that, I also told him I was coming in this direction," said Mourinho.
"Not definitely, because I couldn't say that. It was not done and I had a contract with Madrid and I had to be free of that. But at the same time he knew I wanted to come to Chelsea."
Mourinho was not aware Moyes was in line for the Old Trafford job, but he was not shocked that Ferguson recommended his fellow Scot.
"Everybody in this country knows the job he was doing at Everton, so for me not at all was it a surprise," Mourinho said.
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