Gerrard scored both goals for Liverpool as they won 2-1 away at Marseille.
Gerets said: “Gerrard is a world-class player and he proved that. Only players of that quality can score goals like that.
“We had just scored and we should have been focused on protecting that advantage. But players of Gerrard’s quality are capable of scoring goals like that and he changed the course of the match.
“I am very disappointed with the result. We created enough chances to have won. I am angry with the outcome because we were unable to make use of our good play and the opportunities we created.”
