Belgium coach Roberto Martinez has said he was prepared to call up Lukaku, the national team's record scorer with 68 goals, as long as he could play at least one game in the group stage.
Lukaku missed two months at the start of the season with a hamstring injury and then hurt his thigh two games into his comeback for Inter, where he is in a second spell after joining on loan from Chelsea.
Belgium is in Group F awith Canada, Morocco and Croatia.
Belgium squad for World Cup 2022
Goalkeepers: Koen Casteels (Wolfsburg), Thibaut Courtois (Real Madrid), Simon Mignolet (Club Brugge).
Defenders: Toby Alderweireld (Royal Antwerp), Zeno Debast (Anderlecht), Leander Dendoncker (Aston Villa), Wout Faes (Leicester), Arthur Theate (Rennes), Jan Vertonghen (Benfica), Thomas Meunier (Borussia Dortmund), Timothy Castagne (Leicester).
Midfielders: Kevin De Bruyne (Manchester City), Amadou Onana (Everton), Youri Tielemans (Belgium), Hans Vanaken (Club Brugge), Axel Witsel (Borussia Dortmund), Yannick Carrasco (Atletico Madrid), Thorgan Hazard (Borussia Dortmund).
Forwards: Michy Batshuayi (Fenerbahce), Charles De Ketelaere (AC Milan), Jeremy Doku (Rennes), Eden Hazard (Real Madrid), Romelu Lukaku (Inter Milan), Dries Mertens (Galatasaray), Lois Openda (Lens), Leandro Trossard (Brighton).
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