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The Argentine joined the Blaugrana from Liverpool in 2010, and was largely expected to compete with Sergio Busquets for the holding midfield slot.
However, the 28-year old has since been converted to a central defensive berth where he has featured regularly, but he concedes he is still not a major player.
"Cases like Xavi, Puyol, Leo [Messi], and Iniesta are different [from the rest of the squad]," he told Sport Journal.
"They are the heart of this team, the most important.
"It`s like a movie, [with major and lesser actors]. Everyone is needed, but they should know their place. I am happy with my position and do not intend to occupy a role more important than my current one."
The former Corinthians player went on to dismiss any suggestions of a feud between team-mates Messi and David Villa, who engaged in a heated argument during Barcelona`s recent victory over Granada.
"When things aren`t going the way we want them to, we each have different ways of reacting," the San Lorenzo native opined.
"It`s been [blown out of proportion.] These are normal things."
Barcelona will look to maintain their perfect record in La Liga when they travel to Sevilla on Saturday night.