Eden Hazard sat out Belgium's training session on Tuesday after picking up an injury during the 4-0 victory over Hungary.
The 25-year-old injured his quadricep in the first-half but is expected to be fit for Friday's quarter-final against Wales in Lille.
The captain produced a virtuoso display in Belgium's round-of-16 win, scoring and setting up Michy Batshuayi, and is key to his country's chances of progressing to the semi-finals.
"That's why I took him off," coach Marc Wilmots told journalists on Tuesday. "I think he'll be back the day after tomorrow [Thursday].
"He's working with the physios and he should be 100 per cent on Thursday."
Thomas Vermaelen, suspended for Friday's quarter-final in Lille, also missed the team's training in Le Haillan on Tuesday, with Wilmots hoping that the rest will give the defender time to recover from niggling injuries.
For Wales there is good news as their captain, Ashley Williams, has taken part in their training session after suffering a shoulder injury in their victory over Northern Ireland.