Sterling struck in the rout.
He remarked: "It was a massive win. The Lyon match [1-2 home defeat in September] was one of those a wake-up calls. You lose the ball and these good teams can punish you."
About the first penalty awarded, when he kicked the turf and tripped over, Sterling added: "I went to chip the ball and don't know what happened.
"I didn't feel contact. I scuffed the ball. Apologies to the ref."