There is no way Ronaldo will consider returning to Manchester United after his previous experience that led to him moving to Saudi Arabia. I also think he will rather accept a move to Sporting than return to United, and with the way things are playing out I think he might even retire at Al Nassr.
Well I guess it is. After how he was treated there, I think Cristiano Ronaldo will no longer want to go back there. And not only that, but it is no longer possible for the club to consider Cristiano Ronaldo because he is actually close to retirement age. Maybe his condition is still in prime condition, but still big European clubs will only focus more on bringing in young players.
And yes, the biggest possibility is that Cristiano Ronaldo will indeed retire at the current Arab club, namely Al-Nassr. because I think he is also very pampered there. With a large salary and even at Al-Nassr, Cristiano Ronaldo is truly highly respected so his opinions are always listened to by the club.