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#3 Cristiano Ronaldo's mentorship role at Manchester United
Cristiano Ronaldo first arrived in Manchester as a lanky-18-year-old boy and left Old Trafford as a man.
As the Portuguese has admitted before, Sir Alex Ferguson and the people around Manchester United have been a major contributor to the player he has become today.
That includes his former teammates at Old Trafford, who have reportedly played a key role in convincing Ronaldo to make the trip back 'home'. The likes of Ole Gunnar Solskjaer, Ruud van Nistelrooy and Roy Keane took Ronaldo under their wings, and mentored the youngster during the early days of his Manchester United career.
Cristiano Ronaldo has now returned to the club as a senior statesman and one of the most decorated players in the history of the game.
This time around, he will have a role to play in mentoring the talented youngsters in the squad. The likes of Mason Greenwood, Marcus Rashford and Jadon Sancho should benefit significantly from Ronaldo's presence in the team. Some of them have grown up watching and admiring Cristiano Ronaldo, and will now have the chance to pick his brains and learn about the day-to-day routine of an elite athlete.
Mason Greenwood will probably learn more from Cristiano Ronaldo in the training ground and dressing room than he would as a regular Premier League starter. The 36-year old's experience and know-how alone could be worth the reported £12.8 million United paid for Ronaldo's services.
#2 Reunion with former Real Madrid teammate Raphael Varane
Another intriguing sub-plot to Cristiano Ronaldo's move back home is his reunion with former Los Blancos teammate Raphael Varane.
The duo will have happy memories of playing alongside each other, having won some of the biggest titles in club football together. Cristiano Ronaldo was an integral member of the Real Madrid squad when Varane made his debut for the club in 2011.
The Frenchman soon established himself as one of the premier centre-halves in world football, and was pivotal in Real Madrid's four Champions League-winning teams in five years.
Cristiano Ronaldo and Raphael Varane have together won four Champions League titles, three FIFA Club World Cups, two La Liga trophies and three UEFA SuperCups, to name a few. The duo won a total of 15 major trophies during their seven-season stint in the Spanish capital.
The Portuguese superstar will surely be keen to link up with his former teammate again, and will hope to recreate some of the success they shared at the Santiago Bernabeu.
#1 Jersey number conundrum
It will feel extremely wrong to see Cristiano Ronaldo do his thing in a Manchester United shirt without the iconic #7 at the back.
As things stand, Edinson Cavani remains the holder of the Portuguese megastar's preferred squad number. Since the announcement of Cristiano Ronaldo's homecoming, Manchester United fans have urged Cavani to give away his #7 jersey.
However, that is not possible according to the Premier League regulations on squad numbers.
According to the rules, a shirt number cannot be changed once the season has already begun.
Ronaldo could only be given the #7 jersey if Edinson Cavani was to vacate it by leaving the club in the ongoing summer transfer window. That seems rather unlikely, with just three days remaining in the window. However, the FA can make an exception at times. The Manchester United faithful will perhaps argue that this is indeed an extraordinary circumstance.
The most likely possibility is that Cristiano Ronaldo will don the #28, as he did during his Sporting Lisbon stint. The 36-year-old could also opt for the #12 or the #15 jerseys.
