However, his international boss Martinez labelled the 27-year-old the world's best despite admitting the goalkeeper was going through a "difficult period".
"Thibaut is for me the best goalkeeper in the world, as he showed at the  World Cup," Martinez said on Saturday.
"From there, he is the best person for me to defend Real Madrid's goal.
"It has been a difficult period, but I think that the opportunity to return with the national team has helped him to regain the good feelings, in the same way that we hope that the successes he has at Real Madrid can help us in the Euros."
Belgium were drawn alongside Denmark, Finland and Russia in Group B for Euro 2020.