Cristiano Ronaldo is one of the most accomplished footballers to have kicked football in this generation. He has scored a lot of goals, broken a lot of records, won a lot of trophies for his club and country as well as many individual trophies. He has also made a lot of money in his career and is currently the richest footballer.
Ronaldo is the most commercial and endorsed footballer with him having other sources of wealths other than his football salaries. He makes money from endorsements, sponsorship advertisement and other contracts outside of football, and also from his Instagram account and also from business.
He has already shown what his next profession could be after retiring. Ronaldo is a great businessman and he invests in real estates, hotels, fashion lines, fitness and diets amongst other businesses that are in the CR7 brand. He advertises his business with sponsored posts on his Instagram page.
The chances of Cristiano Ronaldo having a career in football after his retirement are small, he's one of the most gifted footballers the world has ever seen and having worked with many world class managers he surely knows football tactics, but his current businesses shows he will focus more on business, probably an agent or fitness in football, but not a manager.