Ronaldo would command an exorbitant transfer fee.
The Portuguese manager has taken United back to the Champions League.
The forward may be coming towards the end of his Old Trafford career.
The Wales international has endured a frustrating season at Real Madrid, picking up a series of injuries.
Ferguson managed at Old Trafford for 27 years.
José Mourinho has already led United to two trophies this season.
Mourinho's new club is still in the hunt for trophies.
Ibrahimovic has scored 20 times this season.
Bernardo Silva has impressed at AS Monaco.
Henrikh Mkhitaryan says his teammate requires patience.
United wants to sign Antoine Griezmann from Atletico.
Mourinho is seen as the man to bring glory to United.
Beckham signed for Real Madrid in 2003.
Rio Ferdinand was Rooney's teammate at Old Trafford.
Sir Alex Ferguson is United's most successful manager of all time.
Ashley Young has seemingly dropped out of Jose Mourinho's plans over recent months.
Mourinho wants more noise from the Old Trafford crowd.
Patrice Evra served United with distinction under Sir Alex Ferguson.
United has won four successive Premier League games.
Mourinho feels for Moyes ahead of Manchester United reunion.
Mourinho says following Ferguson's success is not a burden.
"Everyone thought he needed to learn," former United captain Rio Ferdinand said of Ronaldo.
Phil Babb was Ronaldo's teammate at Sporting Lisbon.
Mourinho wants a root-and-branch examination of the club.
United currently sit in eighth place in the Premier League.
Ferguson is a club ambassador for United.
Mourinho is the 'deepest thinker' Ronaldo has met in his career.