Martinez was left banging his gums about a goal that Charles N'Zogbia had scored after 39 minutes of the game at Ewood Park.
But the referee thought different and disallowed his effort for a foul on Morten Gamst Pedersen in the build up.
But Martinez says there was nothing wrong with the and it should have stood.
He told Sky Sports: "It's really disappointing on the key moment of the game for me, is the goal disallowed from Charles in the first half.
"In games like these the first goal makes a huge difference, it allows your team to be more composed and in a way the other team has to catch up a little bit.
"I'm extremely disappointed in that respect it didn't go our way today but the performance in a way deserved a lot more and that's where we need to improve - when you are the better side and you create more chances than the local side you need to get the points."