Martinez was unhappy with the award of Manchester United's penalty in their defeat at Old Trafford last weekend.
The Latics chief felt Danny Welbeck dived in winning the first minute spot-kick and feels sometimes the smaller clubs do not get a fair rub of the green. "Sometimes it is true," he admitted. "You look at the incident and you analyse the games you had and just by the law of averages you should get wrong decisions going your way and sometimes it is difficult to understand we don't get that. "It's understandable, but goals happen in the game and they will happen, it is part of our game.
"It is difficult in certain aspects, certain games that you never get wrong calls going your way. "From that point of view, the disappointment you get when you can see in two or three games on the trot, playing against certain teams, and you don't get that measurement that you feel you should be in a normal judgement of two teams. "It is not a good aspect to keep talking about referees this season because that's not going to give us points. "
What we need to do is focus on ourselves, when you assess the game you need to move on from this and just try to see how we can improve, how we can be better and how we move on to a better level of performance and that's what we will carry on doing."