Martino took over from Tito Vilanova at the start of the 2013-14 season, but departed his post at the end of the campaign having only managed to win the Supercopa.
It was in stark contrast to Barcelona’s 14-trophy haul under Pep Guardiola, and the 51-year-old argued that he could only take being held to such standards for so long.
"Pep's Barcelona was the best team in all history. That comparison was never positive,” he said to Marca.
“At Barcelona, winning wasn't enough. If you won, it was thanks to the players and if you lost, it was my fault. It was hard to continue.
“When the players back their coach in public it’s nice at the time but you soon grow weary.”
Martino also had a spell coaching in Argentina with Newell’s Old Boys, where he won the 2013 Clausura.