Napoli striker Dries Mertens insists Manchester City can be beaten.

City are yet to taste defeat this season, but Mertens believes they can be beaten after Napoli ran them close in the Champions League.

"They're not unstoppable because the game at home we played really good and we had chances to make it 3-2 and we didn't score them and two seconds later they scored to make it 3-2," Mertens said.

"That was a bummer but I think they have a very good team, it's working, they're doing really good but like every team, it's going to stop one day."