Ronaldo became the first player to achieve 100 Champions League goals.
A Spanish publication said Real's president may be prepared to offload a striker after disappointing performances against local rival Atletico.
Madeira Airport has been renamed after the Portuguese star, who was born in Funchal.
The Belgian is the subject of interest from the Spanish giant.
Manchester United paid £89 million for Paul Pogba last year.
Thibaut Courtois and Eden Hazard could leave.
Since Ronaldo turned 32 in February, Bale comments on how his teammate's game has changed.
Ronaldo reportedly 'vetoed' Pogba's move to Santiago Bernabeu.
Chelsea is top of the Premier League table.
Aguero has been prolific over six years at City.
David Beckham, Michael Owen and Jonathan Woodgate moved to the Bernabeu.
The Portuguese player is in his eighth season at Real Madrid.
Madrid's streak came to an end against Sevilla.
Sevilla struck twice to end Madrid's 40-match unbeaten streak.
Ronaldo recently signed a contract extension at Madrid.
Oscar signed for Chelsea from Internacional in 2012.
Ronaldo won his fourth Ballon d'Or on Monday.
Ronaldo beat Messi to the award for the world's best footballer in 2016.
It is the second such incident to befall Ronaldo within a month.
Ronaldo joined Real from Manchester United in 2009.
Dortmund ran out with an 8-4 victory at Signal Iduna Park.
Rummenigge believes the Bundesliga can no longer compete.
"Everyone thought he needed to learn," former United captain Rio Ferdinand said of Ronaldo.