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.
Phil Babb was Ronaldo's teammate at Sporting Lisbon.
An excerpt from "Cristiano Ronaldo: The Biography" by author Guillem Balague.
Ronaldo says the move was 'unplanned.'
The Ballon d'Or will be awarded in January.
Ronaldo has signed a new deal at Santiago Bernabeu.
Hazard has scored seven goals in seven games.
Real are preparing deals for some of their biggest stars.
Ferguson is a club ambassador for United.
Bale has signed on at Santiago Bernabeu until June 2022.
Mourinho is the 'deepest thinker' Ronaldo has met in his career.
No live football can be broadcast in the U.K. on Saturday afternoons.
Ole Vidar Toftesund has a cunning plan.
Real Madrid's Isco is out of favor at Santiago Bernabeu.
Capello managed Real in 2006.
Memphis Depay has underwhelmed since his move from PSV Eindhoven last summer.
Ronaldo won Euro 2016 and the Champions League this year.
The Portuguese forward is 32 next February.