Manchester City boss Pep Guardiola says their clash at Liverpool could be a watershed moment.

He reckons Sunday's match will serve as a barometer of what his side can achieve in the coming months as they hunt a quadruple.

"Of course if you want to achieve something that's good and win titles you have to win these kind of games," the Catalan said.

"Liverpool is such an important game, to realise again if we are able to do big things in this season, in important stages, in the Champions League.

"To see ourselves, when we arrive in Basle, knockout games - how is our behaviour? We did it in Stamford Bridge, Old Trafford, and we'll see on Sunday how we do."