Chelsea and Tottenham have clashed in a number of high profile matches over the past few seasons.
Perhaps the most remembered tie between the two London clubs took place back in May 2016 - when Spurs visited their rivals needing a win to keep their title hopes alive.
As we all know - the Blues denied Tottenham that night, salvaging a 2-2 draw and ending any chance of Mauricio Pochettino's men lifting the Premier League.
Sadly, the football wasn't the main talking point of the night - and after an ill-tempered affair, the game became known as 'the Battle of the Bridge'.
A record nine Spurs players were booked during the 90 minutes, as frustrations spilled over past the final whistle too.
On Tuesday evening, the two sides meet again, and ahead of the latest clash, the man who refereed that infamous game in 2016, Mark Clattenburg, has been reminiscing.
Writing for the Daily Mail, the former ref begins by saying that the clash was the most difficult he'd ever tried to control and that he should have sent off at least two Spurs players.
He does, however, acknowledge that he was put in an impossible position because if he had sent two off, he would have been accused of ruining the game.
Interestingly, in the build-up to the latest fixture between Chelsea and Spurs, Clattenburg has also admitted that some of Pochettino's recent comments have 'astonished' him.
VAR IN ACTION
It's been confirmed that VAR will be in use for Tuesday's game - which means it's highly unlikely we'll see anything of a repeat from 2016.
But ahead of the match, the Spurs boss has revealed he's told his team to be "a little bit naughty" if they want to win trophies this season.
And it's these comments that have confused Clattenburg.
"I am astonished that Pochettino has said his players need to be naughty. That is not exactly the best thing to say when both clubs have urged their fans to behave themselves.
"He may be trying to get a reaction from his players - especially given this competition represents Tottenham's best chance of winning a trophy - but any dirty tricks at Wembley will be spotted and punished."
As Clattenburg suggests, the Spurs manager may have made those comments to get a reaction from his players - but surely they'll have to reign it in for Tuesday's cup tie with VAR in use.