Premier League leaders Chelsea play EFL Cup winners Manchester United in the FA Cup quarter-final at Stamford Bridge on Monday.
Here, we look at some of the talking points ahead of the contest.
Manchester United boss Jose Mourinho turned his ire on Antonio Conte, his successor at Stamford Bridge, after Chelsea beat United 4-0 in the Premier League in October. Mourinho took exception to Conte geeing up the crowd when the Blues were already four goals clear. It took some of the attention away from his side's poor performance and expect more moaning from Mourinho if United are beaten again - or wild celebrations if his side can advance to the semi-final at the expense of his former club.
Mourinho has continually bemoaned United's hectic fixture list, pointing to Chelsea's light schedule in comparison, but without acknowledging his role in the Blues' absence from European football. Being drawn to play Rostov in the Europa League hardly helped matters and now he must manage his options for next Thursday's second leg and the Chelsea tie. Conte can field a first-choice XI. At least Mourinho cannot complain about a replay - the quarter-final must end on the night and could go to penalties.
Diego Costa, Eden Hazard and Cesc Fabregas were branded 'rats' by some of their own supporters in December 2015 in the days after Mourinho's sacking for a second time. The trio were perceived to have under-performed for the self-proclaimed Special One. But they have recovered their status in the eyes of Blues' fans, helping power Chelsea towards the Premier League title. And now their former boss stands in the way of a possible league and cup double.
Bus to be parked?
With Zlatan Ibrahimovic suspended and Wayne Rooney, Marcus Rashford and Anthony Martial seemingly not fully in favour, where will Manchester United's goals come from? Chelsea have been lethal on the counter-attack this season and have lost just once at home and are seeking a club record 13th successive home win. They may have to take more of the initiative in what could be a cagey encounter. Expect the United bus to have its handbrake on and a wheel clamp in place which Chelsea will have to try to remove.
Mourinho, for so long adored by Chelsea supporters who were reluctant to see him leave in September 2007, has lost that affection since his move to Old Trafford. His October return to Stamford Bridge went by in almost apathy as Chelsea fans focused their attentions on Matthew Harding on the 20th anniversary of the former Chelsea chief's death. And now Conte is the favoured one, with Mourinho considered just another opposing boss.