Chelsea midfielder John Obi Mikel insists they're capable of upsetting Champions League opponents Napoli.

The Italians are trying to defend a 3-1 lead in the last 16 tie.

But Nigeria midfielder Mikel declared: "It will be a football war on the pitch in the second leg.

"We did our best in the first leg but need to go the extra mile to beat them and move to the next stage. We will go all out from the first whistle.

"This is a trophy we want at all costs. We cannot afford to be eliminated now."