Zabaleta believes that Toure's return from injury could now help to propel the Blues towards a second Premier League title in three years.
"You always need big players in the team. I think Yaya showed one more time that he's one of the main players of this team," the Argentine is quoted as saying by Sky Sports News.
"He's having a great season; one assist, another goal, fantastic for the team and great to see Yaya back."
City continue their title challenge on Saturday evening when they face Everton at Goodison Park.