England’s game against USA on Saturday ended in a 1-1 draw following an howler from Green.
Gerrard scored England’s goal while Clint Dempsey scored the goal for USA.
Gerrard said: “It was one of those freak things, I don’t think you can criticise the keeper. People have been talking about the ball and it is tricky.
“Rob will learn from this and he might make an important save that wins us a match. We’re all behind him. It was a bit of shock and it took us a while to get over it.”
He added: “It was a difficult game. The most important thing in the opening game is not to lose.
“The idea was to win but unfortunately we let a poor goal in and we couldn’t go and get the winner. The target now has to be seven points.”
