"If Manchester [United] need a coach, I'm the man to do it. I know they sell lots of shirts around the world, but they need to win trophies, too. I can do that for them."
"Manchester United used to be my favourite English team for so long. So many great players and a great team under Alex Ferguson. But now I have to say Man City. I know you shouldn't change like that but it's because of Kun [Aguero]. We speak a lot and he plays in a very good team."
Maradona added he is not impressed by Paul Pogba's work rate at United, and compared Old Trafford to Boca Juniors' La Bombonera stadium.
"With United I liked Ander Herrera. Paul Pogba? Doesn't work hard enough.
"I played at Old Trafford [in the 1983-84 Cup Winners' Cup quarter-final]. What noise, like La Bombonera."
Maradona featured for Barca as they clashed with United in the last eight of the UEFA European Cup Winners' Cup in 1983-84.
The Catalans comfortably won the first leg 2-0 at the Camp Nou but were defeated 3-0 by an inspired United side captained by Bryan Robson.
Robson scored a brace as United recorded one of their most famous European nights at home.
Maradona is currently in charge of Mexican second-tier side Dorados.