Fabio Capello's men will take on Bulgaria away on Friday evening ahead of a home clash against Wales next Tuesday, at the end of which England would be looking to remain top of Group G.
"It's in our hands," he said in a news conference.
"In the way we perform and the way we play we must be very positive.
"In our minds we're coming here as a group of players to pick up three points.
"These next two games we must pick up six points and put ourselves in a very good position in the group.
"Clearly we've got an awful lot of talent within the squad. We must believe."