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A 27-6 loss to Wales inflicted a significant dent on their hopes for the title however, with the match also seeing Nyanga pick up a groin injury that would rule him out for the rest of the tournament.
The Toulouse man was left to watch on from the sidelines as his side then recorded a narrow victory over Scotland before falling 22-20 to Ireland in Paris last weekend - Damien Chouly's late try ruled out for a forward pass by Pascal Pape in the build up.
It left them finishing fourth in the table, two places higher than last year, and while acknowledging there is still room for improvement, Nyanga believes progress is being made.
"Despite the loss to Ireland, I found the match showed a reason to be hopeful," he said.
"Facing a team seen as one of the biggest threats of the competition, the team demonstrated desire and that pleased me.
"Of course there is still much work to be done. But this work concerns the small details, a better placed pass, a better measured kick.
"It's a number of details which make the difference at the highest level of sport. We know that.
"But the lesson I take from all our games in the tournament is that there is real potential in this team. We just need to make sure we release that potential, like against England and Italy."