Jose Mourinho declared Cristiano Ronaldo's move back to Manchester United is "perfect business".

In a remarkable turnaround on Friday, United confirmed they had agreed to sign Ronaldo – who left Old Trafford in 2009 – from Juventus.

The 36-year-old is reportedly completing a medical in Lisbon this weekend, with personal terms and a visa to be finalised.

Mourinho, who is now at Roma after an ill-fated spell at Tottenham, managed his compatriot Ronaldo at Real Madrid between 2010 and 2013 and later went on to coach United as well.

Ronaldo had one of his best goalscoring seasons in 2011-12 under Mourinho's tutelage, scoring 60 times across 55 appearances in all competitions.

The forward averaged 1.1 goals per appearance, or one every 81.7 minutes. That haul included seven hat-tricks and he also provided 15 assists over the course of the season.

Asked for his thoughts on Ronaldo's swift departure from Serie A, and his United return, former Red Devils boss Mourinho told a news conference: "The only thing I say – and it looks to me something basic and logic – is that if Juventus are happy, if Cristiano is happy and if Manchester United are happy, this is the perfect business.

"I think there is no need to talk about Cristiano.

"There is no need to make any comment about someone who plays, wins, scores and makes history for 20 years."

Ronaldo represents United's fourth addition of the transfer window, following on from Tom Heaton, Jadon Sancho and his former Madrid team-mate Raphael Varane.