Guardiola had lunch with Ferguson five months before the Scot announced his retirement from football, prompting speculation that the former Barcelona boss had been offered the job during his 12-month sabbatical.
The 43-year-old will lead his Bayern side out at Old Trafford for the first leg of their Champions League quarter-final against David Moyes's United on Tuesday, and he admitted that any job offer may have been lost in translation.
"He invited me to a super restaurant. It was a friendly dinner, like always. He was so gentle and we spent a very good time together," Guardiola told reporters.
"My English is not so good and when Sir Alex spoke quickly I didn't understand him so maybe I didn't understand if I received an offer or not."
Current holders Bayern are bidding to become the first team to retain the trophy in the Champions League era.