Martinez also praised Robles for his reliability in coming into the team in such good form.
“Overall it was well-deserved passage through to the next round with the quality we showed in the penalty shootout,” Martinez said after the game.
“I thought it was a fantastic cup tie. Norwich deserve credit. Technically they had a very impressive performance with the movement they had. They got the crowd frustrated in spells but we coped with it well.
“In the second half, when Ross and Gerard came on, we had the best chances. We were more patient and found a way of getting through.
“Looking at the other results elsewhere, it shows you how difficult it is to get into the position that we are now. Our performance deserves a huge amount of credit.
“We will look forward to the draw and seeing who we are going to face. But there is still a long way to go before you can think about getting in a position about winning a trophy.
“I thought the sucking powers of the Gwladys Street today were in our favour. There was an incredible atmosphere and I thought our players controlled that very well.
“Joel was, throughout the game, himself. I thought he had the moment of the game – his save from Lewis Grabban was terrific. His composure and demeanour was very good and his penalty save from Wes Hoolahan was very impressive.
“I am very pleased for Joel because he had been working very hard behind the scenes and is starting to show how reliable he is.”