The former Manchester United and Real Madrid defender joined manager Mikel Arteta's backroom staff this past summer.
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Currently top of the Premier League table, the Gunners have conceded just seven goals in 14 games.
"Gabriel Heinze helps a lot, especially the defenders," Saliba told the Men in Blazers media network.
"He gives us energy because he’s always talking, always loud - even in training when we do simple things, he’s always loud.
"He talks a lot and it’s good to have him close to us. I think this guy can help us a lot."