Three reasons why Peterborough will knock Chelsea out of the FA Cup

The Posh’s form

The visitors head to London in very good form.

The Posh have not lost a game in all competitions since November, an unbeaten run that has so far lasted seven matches.

McCann’s men will be aiming to make it eight without defeat in west London on Sunday.

A combination of form, risky rotation and bad Blues morale could see the Posh pull off a superb victory.