Manchester City have splashed out £80million on four players so far this summer in a bid to break into the top four and secure Champions League football.
"I am very confident [we'll do better than last season]," the Frenchman told the club's website.
"We know in England that the Premier League is the biggest league in the world and everybody invests a lot of money.
"We invest in our work, in our beliefs, in the quality of our behaviour and I am confident that will pay off. "We finished third last year and we hope we can improve on that - but the race will be tough."