Messi again beat Iniesta to the Ballon d'Or last month.
But Iniesta said: "We're on the podium together, but we are never rivals - for me he is my team mate and colleague. Leo's winning of the Ballon D'Or made me just as happy as it did him. Everyone's individual potential reaches its maximum when you are part of a team.
"Barça are better with Leo and Leo is better with us. Football isn't an individual game - it's a team sport where by working together, all of our individual abilities have a better chance to shine. I'm better with Leo, Leo's better with us - that's the important thing: that we are all aware of our responsibility in making things work."