Guardiola was heavily tipped to move to Old Trafford when Sir Alex eventually retired but instead surprised many by announcing his intention to join the Bavarian giants in January of 2013.
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"He invited me to a super restaurant," the Bayern coach told reporters at his pre-match press conference.
"We had a very good time but my English is not so good, so when Sir Alex spoke quickly I didn't understand him. Maybe I didn't understand if I received an offer or not!
“It was a friendly dinner, like always he has with me. He was so gentle and we spend a very good time together.”
Guardiola also offered consolation to David Moyes who, in his first season at United, has overseen a number of poor results.
The Red Devils are currently seventh in the Premier League but the ex-Barcelona manager believes the 50-year-old needs a “little more time” to prove his managerial ability.
"No one can have the secrets to eternal success. No one can win titles without big players and I was lucky throughout my career to have big, big players,” he added.
“I have a lot of respect for my colleagues and, when Manchester United decided to take David Moyes, it is because they are able to do it. Sometimes you need a little more time. The decisions of Manchester United are always right. They know he is a good coach and did a good job at Everton.”