The French winger left the Latics in the summer having played a major part in keeping them in the Barclays Premier League.
His record for Wigan was far from spectacular, with 18 goals in 90 appearances, but many of his performances were vital in their continued survival in the top flight. Since his £9.5million summer move he has found the net once in 23 games and his displays have been patchy.
Martinez had the option to follow N'Zogbia to Villa Park at the end of last season as a replacement for Gerard Houllier but remained loyal to Wigan chairman Dave Whelan, who has so much faith in the Spaniard.
"You go past that when you make a decision. The decision from a human point of view was the right one," Martinez told Press Association Sport. "I will never look back to that - and there is too much at stake at the moment to think about individual issues: my decision, when we sold Charles N'Zogbia.
"There are clear links between the two clubs but at the moment the game is so important for us and all that counts is to get the points we need to achieve our aim of staying in the Premier League. All the individual issues should be in the background."