Inter striker Romelu Lukaku’s place in Belgium’s World Cup squad remains in doubt as he battles to prove his fitness following his latest injury setback.

As reported in today’s newspaper edition of Corriere dello Sport, the striker must prove that he will be fit and available by the time Belgium face Croatia in their final Group F fixture on 1 December, in order to convince coach Roberto Martinez to include him in his squad.

Lukaku returned to Inter on loan from Chelsea this summer but has endured a difficult second spell at the club, having suffered an injury in August that ruled him out until late October.

Having marked his comeback with a goal against Viktoria Plzen in the Champions League, the former Manchester United striker suffered another injury and is facing a race against time to make the World Cup squad.

The 29-year-old is completely ruled out of Inter’s final Serie A match of the calendar year, against Atalanta tomorrow, and a decision will be made as to whether he travels to Qatar for the tournament or remains behind to work on his rehabilitation.

Lukaku has been included in Belgium’s initial 26-man squad but his condition will be monitored before a final decision is made.