Tottenham vs Chelsea is a rivalry of epic proportions and a man who has played for both made no bones about where his loyalties lie.
talkSPORT presenter Jason Cundy He played for both during his Premier League career, but his colors are firmly nailed to the mast.
And that's despite being forced to sign for Spurs and being a lifelong Blues fan.
Before the big London derby, Cundy made fun of his past at Tottenham. talkSPORT Inside Chelsea YouTube Show.
“Well, it was terrible,” he laughed.
“I mean, I don't even want to talk, just keep going, please. I can't talk about it.
“I don't have any love for the Spurs,” he continued. “I don't like Spurs as much now as I did before I joined them.”
Cundy was part of Chelsea's academy but left Stamford Bridge in 1992 after 41 league appearances and two goals.
He initially joined Tottenham on loan, but then left permanently for White Hart Lane later that year.
The defender spent four years at the north London club, but only made 18 league appearances, before moving to Ipswich in 1996.
Asked how challenging the transfer was for him, he added: “It was a very strange scenario because I just signed a four-and-a-half-year contract in November, and when March came around, Chelsea accepted an offer.
“I got a phone call from Ian Porterfield saying, 'We've accepted an offer and Terry Venables will call you this afternoon.'
“Back then it was very different because, if the club wanted you to leave, you left.
“And now the players have much more power. If the club wants you out, they want you out. And they wanted the money more than me. Chelsea made their decisions.
“They made their decisions. And unfortunately, I had no choice but to make mine. But look, it's part of my life. It happened.
“And you know, I'm very lucky now. I left, but I'm back.”
The clash between the two teams will be intense just over a year after Chelsea beat Tottenham 4-1.
The game saw Christian Romero and Udogie Destination expelled, while James Maddison and Micky van der Ven had to withdraw due to injury.
Historically, battles between both sides have also been explosive.
And asked if that fire was always there, he added: “Even in the youth team. In the youth team it was ingrained in you what this game meant.
“But as a Chelsea fan, I didn't need to be told that because it was there. The game will crackle.”
And there are certain games, and that's why I love football, because there are certain games in certain stadiums where you know you're on to something big.
“I know Brentford are a west London rival. Brentford under the lights or Spurs under the lights. Let me tell you, you can't compare the two.
“There's nothing compared. And whoever is in the stadium at the weekend, the Chelsea fans, right? They'll be there. It'll be like a proper battle.”