The Frenchman admits he struggled for form during the tournament as the home nation reached the final.
"It was a very difficult Euros, disastrous. We could not win the title and I was always on the bench," lamented Martial.
"It happens, I'm young. I'm going to learn from this.
"It was the first time I had played so much for my club, but that is no excuse. I should have done better."