In a potential blow for Iceland, winger Johann Berg Gudmundsson - who is central to the team's quick, counter-attacking style - is a doubt after tearing a muscle in the Argentina game.
If they win and Nigeria draws, Iceland has to make up the goal differential, which means beating Croatia by at least two goals (their current deficit in differential).
The Super Eagles are now second in Group D and their concluding group match against two-time champions Argentina will be billed as a winner-takes-all tie.
An own goal from Oghenekaro Etebo and a penalty kick from Luka Modric handed the Croats their first win of the competition.
President Muhammadu Buhari heartily congratulates the Super Eagles on their victory Friday over the national team of Iceland in their second match at the Russian Federation 2018 FIFA World Cup.
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A draw would be enough to eliminate the Argentines but would leave Nigeria's fate hinging on the outcome of Iceland's game against Croatia.
"We realised at half-time that we needed to do something to change the game, and that was why we brought in Tyronne Ebuehi to add more offensive force on the left flank".
The tireless Moses was released down the right and his cross was met by Musa who teed up the ball deftly with the outside of his right foot before unleashing an unstoppable half-volley into the roof of the net.
Wilfred Ndidi almost made it two shortly after, but his well-struck, deflected shot was tipped over by Thor Halldorsson for a corner. "It's going to be a tough and hard game for us".
Croatia top the group after 2-0 and 3-0 wins against Nigeria and Argentina respectively, but Hallgrimsson is undaunted.