Wanderers have lost all three games played so far in League Two this season, the most recent of these coming last weekend at the University of Bolton Stadium against the Exiles.
Speaking ahead of the clash against Harrogate today, Evatt revealed that the Wanderers defence won just two of the 18 crosses which came into their box last weekend.
Set pieces have proved to be Wanderers' undoing on several occasions this season and Evatt wants to see more aggression in his defenders when it comes to dealing with balls into the box.
He said: "I’m happy to share stats. There’s no hiding things from you guys. There was 18 headers in our box on Saturday, we won two of them.
Read more on manchestereveningnews.co.uk