The Spanish midfielder insists that the Blaugrana players are behind their coach despite being dethroned at the top of La Liga after a 3-1 defeat to Real Sociedad
The Spain international played the full 90 minutes in his side's 3-1 defeat at Real Sociedad on Saturday - a result which saw the reigning champions drop to second in the table, three points behind Real Madrid.
Even though the Catalans remain in the running to retain their league crown, are well placed to reach the quarter-finals of the Champions League and face their great rivals in the Copa del Rey final in April, reports in Spain suggest that Martino could leave Camp Nou at the end of the season.
However, Iniesta told the club's official website: "The coach trusts the team to win and he always wants the best for his team, therefore, the players have no doubts regarding the coach. On the contrary, we are with him to death.
"We played really well in the matches leading up to this weekend but the defeat to Real Sociedad was tough. The players and the coach are, in the end, responsible for everything.
"Starting now, everything is practically a final. We have to win all of our games if we want to reach the end of the season with options to win the title."
Barca's title rivals, Real and Atletico Madrid, face off in the league on Sunday but Iniesta has no preference as to who he wants to emerge victorious at the Estadio Vicente Calderon.
"You never really know what the best outcome is," the midfielder noted. "We're one game away from being leaders and we have to face both teams.
"It's clear that we depend on ourselves and we have to do a good job. If we don't do our job it's of no use to us if Madrid or Atletico win."