Some of their World Cup rivals need less of an introduction than others.
It will be a first meeting between Haiti and the Scots, but Clarke and his team will not be taking them lightly.
They beat Nicaragua 2-0 last month to qualify for just their second World Cup - despite their manager having never been to the Caribbean island.
Sebastien Migne has been unable to set foot on Haiti since being appointed 18 months ago because a conflict in the country forces them to play their home matches 500 miles away in Curacao - an island nation just off the coast of South American country Venezuela.
Scotland have not faced Morocco since that game in Saint-Etienne, which has been their only meeting.
Perhaps worryingly for Clarke, Morocco are on a 12-game winning streak.
Brazil are closing the new year with a mixed bag of results. In their last outing they drew 1-1 with Tunisia, and they have also lost to Japan and Bolivia in recent months.
However, Carlo Ancelotti's star-studded team will still go to the finals in the mix, and Scotland will be hoping they don't meet them in Atlanta or Miami needing a positive result.