Wigan boss Martinez: We do not miss Villa winger N'Zogbia
Zog faces his old club today.
Martinez said: "You can't replace an important player like Charles. Instead you have got to change how you play.
"We are creating more chances but that is down to playing a different way. Other players have stepped up and taken the responsibility.
"I am very pleased with that department. We have found the right mixture in our attacking play and the solutions to be an effective unit going forward."