The Leicester City man suffered a double fracture to his eye socket following a clash of heads with Russia's Daler Kuzyaev on Saturday night, and he has now been ruled out of the rest of the tournament.
Further back, Jan Vertonghen took a blow to the ankle against Russia and may be spared with the clash against Finland in mind, so Thomas Vermaelen could deputise alongside Toby Alderweireld and Dedryck Boyata.
Kevin De Bruyne is also expected to be back in the matchday squad after recovering from his own facial fractures, but a spot on the bench most likely awaits for the playmaker, while Axel Witsel has overcome an Achilles injury and is now available.
Romelu Lukaku's well-taken brace at the weekend saw him become just the second Belgian ever to score in separate European Championships, and the Inter Milan star should once again be supported by Dries Mertens and Yannick Carrasco, unless Martinez deems Eden Hazard worthy of a starting place.
Belgium possible starting lineup: Courtois; Alderweireld, Boyata, Vermaelen; Meunier, Tielemans, Dendoncker, T. Hazard; Mertens, Lukaku, Carrasco