Ferguson feels the side need to show more composure in front of goals .
Ferguson had one of Millwall 's best chances against the Dons but saw his close - range shot saved by goalkeeper James Shea in the first half .
Ferguson , who had one of Millwall 's best chances against the Dons but saw his close - range shot saved by goalkeeper James Shea in the first half , feels the side need to show more composure in front of goals .