Belgium were absolutely torn to shreds in their Nations League opener against the Netherlands, and have recently lost their place at the top of the FIFA world rankings. Their only victory in their last four was a 3-0 friendly win over Burkina Faso.
Poland got their Nations League campaign off to a winning start, albeit against a weakened Wales side. Their only defeat in their last 10 was against Hungary, and that only came once a spot in the World Cup playoffs had been guaranteed.
The absence of Lukaku is a huge one and while Belgium may put in a better performance in midweek, Poland should be able to grind out a result.