Victory over Estonia at Wembley on Saturday would leave the team requiring only a draw in Russia next week and another in their final game against Croatia on November 21 to reach next summer's finals.
"For England, if we didn't qualify it would be a nightmare," he said. "As a player you want to play in all the big tournaments and around the time of the Andorra game we were under a lot of pressure."
He added: "But I always believed we were going to qualify. We have two games coming up and we know if we can get maximum points from them we will almost be in the tournament."