Nacer and Jan both played 90 minutes and Mousa was a late substitute in a 2-0 win against Scotland at Hampden Park.
Just as significant was a draw between Croatia and Serbia to leave Belgium top of Group A by five points from Croatia with two matches remaining.
Next up, Belgium travel to Croatia on October 11 - a point, and they will be on the plane to Brazil next summer.
Kyle Walker played 90 minutes as England beat Moldova 4-0 at Wembley to top Group H. Andros Townsend and Jermain Defoe were unused substitutes.
Vlad Chiriches captained Romania to an important 3-0 win against Hungary in Group D. The result means Romania are two points clear of Hungary in second with three matches remaining - the runners-up go into the play-offs.
Hugo Lloris and France suffered a blow as they battle it out with Spain in Group I.
The goalkeeper was back in the Dinamo Arena, Tbilisi, Georgia - venue of our recent Europa League play-off win against Dinamo Tbilisi - and kept another clean sheet, but France couldn't find a winner as it finished goalless.
Hugo made two fine saves to keep out Tornike Okriashvili but the draw means France are now three points behind Spain with two games remaining - Spain have home matches against Belarus and Georgia.
Roberto Soldado was an unused substitute as Spain beat Finland 2-0 in Helsinki.
Gylfi Sigurdsson helped Iceland keep their hopes of qualifying alive in an amazing match against Switzerland.
The midfielder played 90 minutes as Iceland took the lead but then found themselves 4-1 down in Basel.
However, goals from Kolbeinn Sigthorsson and two crackers from Johann Gudmundsson to complete his hat-trick, rescued a point for Iceland, the equaliser in added time!
Switzerland still top the group on 15 points with three matches remaining but the standings then read Norway 11 points, Albania 10, Iceland 10 and Slovenia on nine. Iceland's next two matches are at home as well, against Albania and struggling Cyprus.
Christian Eriksen hit the winner as Denmark beat Malta 2-1 in Ta'Qali. The midfielder beat two men in the area, skipped past the goalkeeper and then hit a shot that struck the underside of the crossbar, hit defender Ryan Camilleri on the goal-line and bounced home. Denmark are fifth of six in Group B.