This season, for the first time, quarter-finals will not go to replays.
Over the weekend, all ties were won inside the 90 minutes. It means if the scores are level at Stamford Bridge a game will go to extra-time and potentially penalties at this stage in the tournament for the first time in the history of the FA Cup.
In addition, both teams will also receive an additional substitution if it does.
With Jose Mourinho dealing with an injury crisis that means he has no strikers available for tonight’s tie, he might opt for some defensive tactics that increase the prospect of extra-time. But who would that suit best?
We’ve looked at both Chelsea and Manchester United’s recent history when it comes to games that went beyond 90 minutes in a bid to discover if they thrive under the pressure or bottle it when it matters.