Rooney spent 13 years at Old Trafford before leaving in 2017 and is now part of the coaching set-up at Derby while still starring on the pitch.
He came close to leaving United in 2010 having handed in a transfer request, and he has admitted he wanted to join Barcelona.
Chelsea and Real Madrid were also interested while there was talk that Manchester City were keen on Rooney too.
Though England’s record goalscorer has revealed a move to the Etihad was never an option, though he dreamt of a move to Spain.
Rooney told the UTD Podcast: “I think it was well documented that Chelsea and Mourinho wanted to sign me.
“There was Real Madrid, Barcelona and the Man City thing keeps cropping up, but there was never the option for me to go there.
“Although there were rumours on that as well, but the other three, really, were more realistic options.
“In my head, at the time, in that two-day period, I was ready to go and play in Spain.
“Ideally, I would have liked to have gone to Barcelona, but it was looking more likely to be Real Madrid than Barcelona.
“I remember sitting down for one day and thinking ‘imagine playing in that Barcelona team – Messi, Xavi, Iniesta and Busquets’.
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“And at that time Messi wasn’t playing the way he plays now, as a No 9 for instance. He was out wide.
“I was thinking I could have slotted in perfectly. I could have come to the ball as well and have players running in behind. I remember thinking about that.
“Chelsea were always there as well.”