He said: "That is one part of our game need to improve as we know that we can produce some good football.
"We have to make sure goals come from other players, not just Carlton Cole. Today has been good. We scored two goals, one from a defender, one from a midfielder.
"We were very professional. It was a good game for us. We gave them some chances but from our point of view we created so many opportunities to score.
"I am pleased as it has been a good performance and a perfect way to start the season. The team looked in control of the game. When you are winning 1-0, something can happen and you obviously fear something like that. Fortunately the team was focused."