Mahrez struck a superb free-kick to beat Nigeria 2-1 and reach the final last night.
"It was a tough match against a good team from Nigeria," he said.
"We had the opportunity to kill the match, we did not do it. It was a pretty good match .
"It was not easy to create opportunities but I think we were strong. They had this penalty with the VAR but other than that, I think they did not have much. And we had a chance with this free-kick and I took my responsibilities."