That makes Belgium the first European team confirmed for the World Cup besides host nation Russian Federation.
Gibraltar is small in terms of football standards, the national team is not professional athletes who work at their main work during the day, but in the evening they train and have the opportunity to play with the best European teams.
Belgium's 35-goal haul in eight matches is the most by any team in the 2018 European qualifiers.More news: Kenya's Supreme Court declares presidential vote invalid
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Greece right-back Zeca then equalised shortly after before Lukaku popped up to restore Belgium's lead.
Brighton midfielder Propper scored his second in the 80th minute to seal victory, heading Quincy Promes' cross into the far corner. Belgium has 22 points, Bosnia-Herzegovina 14, Greece 13 and Cyprus 10.
Belgium became the first European side to join hosts Russian Federation at the 2018 FIFA World Cup™ after a 2-1 victory away to Greece on Sunday ensured the Red Devils will finish top of UEFA Group H, and with it, claim the automatic qualification spot. In the second half we got more space and we scored a goal, but it could have gone the other side of the post.
Estonia is fifth with eight points while last-place Gibraltar has lost all eight matches.