Lukaku tied Cristiano Ronaldo for the tournament lead with four goals, becoming the first with consecutive two-goal games in the World Cup since Diego Maradona and Gary Lineker in 1986.
"Eden Hazard has a calf knock, Dries Mertens has an ankle problem".
"We need to look after every individual in order to be as strong as we can for the knockout phases", he said.
Both have already qualified for the last 16 - only the group victor needs to be decided - so Thursday's Group G finale in Kaliningrad provides a rare chance in an unrelenting World Cup schedule to rest exhausted legs, recover from injuries and avoid the risk of suspensions.
But that's the World Cup, where if you want to win the title you need to get through seven games in a little over four weeks, and win four of those games against the best in the space of 16 days at the business end. "But like any other player he knows well that what matters is improving as a team".
Thursday's clash in Kaliningrad against England, who can assure their own qualification by beating Panama on Sunday, will stretch a side that truly believes it can go all the way in Russian Federation and better a previous best semi-final finish. I don't want to go back to England in July with a losing feeling.More news: Romelu Lukaku grabs two, picks up injury vs Tunisia
With that in mind, Martinez said he was unlikely to field any players who have a yellow card in case they picked up another and are disqualified from the round of 16.
"Today what I saw is a team that it was prepared to suffer, prepared to work for each other, and we look well-balanced in that respect", Martinez said. "I feel ready if the trainer needs me". Although none of those injuries appear serious, they are obvious candidates to miss the England match to ensure they are 100 per cent fit for the knockouts.
Belgium and England are now locked at the top of Group G with identical records, but a draw will mean that fair play could be factored into the calculations of who wins the group.
The Group G victor next plays the runner-up from Group H, where three teams are still in contention - Japan, Senegal and Colombia. Just a talking point at this stage between two teams with identical records at the top of Group G.
Just as England are evolving a fresh, open approach with the national team, lightening the experience by throwing old feelings and dead ideas over the side, so too are Belgium learning to embrace global competition free of anxiety and fear. Assuming they play, the match will pit Manchester City teammates Kevin De Bruyne and John Stones against one another, while Kane could have to beat Tottenham defenders Jan Vertonghen and Alderweireld if he is to add to his tournament-leading goal tally.
Kompany has not played since injuring his groin June 2 in a pre-tournament friendly against Portugal in Brussels.