Manchester United striker Romelu Lukaku will miss the Nations league clash against Iceland on Thursday.
Lukaku, who has not scored for United since the middle of September, will be forced to miss the game because of a hamstring injury.
"Romelu will train today with the group," Martinez told reporters. "He's had a very positive reaction so we'll take it day by day, see how he feels and we'll take it [him playing] into consideration."
Belgium only need a point against Switzerland to guarantee their progress in the competition, regardless of their result against Iceland.