European champion Portugal held Belgium to a tame 0-0 draw, a result overshadowed by fears that defender Vincent Kompany may have sustained an injury early in the second half.
The injury-prone Kompany walked off shortly after the break after appearing to overstretch while making a defensive challenge. It was not immediately clear if he was injured or left the field as a precaution.
The Manchester City defender's career has been blighted by injuries, but he appeared fit ahead of the pre-World Cup friendly at the King Baudouin stadium.
Kompany's departure was the major talking point in a disappointing goalless draw which underscored that Belgium's star-studded squad still has work to do if it is to live up to its billing as one of the favorites to win the World Cup in Russia.
Belgium fans jeered their team off the pitch at full time.
Portugal was without Cristiano Ronaldo, who was rested after winning the Champions League a week ago with Real Madrid.
Portugal faces neighbor Spain, Iran and Morocco in Group B at the World Cup, while Belgium is in Group G alongside England, Panama and Tunisia.
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