Several teams are still in the chase for a guaranteed spot in Poland and Ukraine alongside the joint hosts and already-qualified world and European champions Spain, Italy, Netherlands and Germany.
England need one point to book a ticket to next year's finals but Montenegro, their hosts on Friday, would advance by winning their final two matches in Group G.
Group B remains wide open with leaders Russia, Ireland, Armenia and Slovakia all still in contention while France head into their last two Group D ties one point clear of nearest challengers Bosnia who they meet in their last game.
Croatia can qualify and condemn Greece to the playoffs with victory in their Group F match in Piraeus while Denmark and Portugal must win their games in Group H on Friday to set up a winner-takes-all clash when they meet next Tuesday.
Netherlands have clinched a place at the finals because they will at least be the best runners-up but they can finish top in Group E by avoiding defeat at home to Moldova on Friday.