Real Madrid great Ronaldo believes the LaLiga champions should sign Kylian Mbappe ahead of Paris Saint-Germain team-mate Neymar.
Mbappe has been tipped to make the move to Madrid at some stage in his career, with Los Blancos reportedly eyeing a 2021 transfer.
Former Barcelona forward Neymar – who joined PSG in a world-record €222million deal in 2017 – has also been linked to Madrid previously.
But Brazilian legend Ronaldo, a LaLiga winner with Madrid in 2002-03, prefers France's Mbappe over countryman Neymar due to age.
"Right now, it is not that one is better than another, but if Real Madrid had to make a big investment, they should do so thinking about the future," Ronaldo said during a webinar hosted by Santander.
"Neymar is 28 years old and Mbappe is 22.
"As an investment, it would be more logical to bring the younger [of the two]."
Mbappe and Neymar are preparing for Sunday's Champions League final against Bayern Munich in Lisbon.
French powerhouse PSG will feature in their first Champions League decider, having dominated domestically.
Neymar – who won the 2015 Champions League with Barca – and PSG have already claimed Ligue 1, Coupe de France, Coupe de la Ligue and Trophee des Champions in 2019-20.
"He needs to win the Champions League to complete his season," Ronaldo said of Neymar.
