France head coach Didier Deschamps says Anthony Martial was a "bit clumsy" and his finishing was "lacking" against Portugal.
Martial replaced Olivier Giroud in Deschamps' starting XI for a Nations League clash in Lisbon on Saturday night.
France booked their place in the finals of the competition by beating Portugal 1-0, with N'Golo Kante netting the all-important winning goal in the 53rd minute.
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Les Bleus might have earned a more emphatic victory had Martial made the most of his chances, but he twice failed to find a way past Rui Patricio after being played through on goal.