There's no love lost between Spurs manager Mauricio Pochettino and former Barca playmaker Xavi.
The Argentine used to play for Catalan rivals Espanyol, and the pair locked horns on more than one occasion.
So when Xavi revealed this week that pal Pep Guardiola was planning on buying Dele Alli in the upcoming transfer window, Pochettino was in no mood to let the speculation slide.
'Xavi is my enemy and tried to destroy our focus to win,' said Pochettino, according to the Mail Online. 'Maybe he is working for Manchester City, he wants to help Guardiola.
'He hates me because he is a Barcelona player and a fan. I know him very well, I played against him a lot and when I was a manager.'
He added: 'Clubs with a lot of potential are now focused on our talented players because we're doing good things.'
Pochettino is known for being one of the most reserved speakers in the Premier League, but theirs' is a rivalry that has simmered for nearly a decade.
In a conversation with Thierry Henry at Tottenham's training ground, Pochettino referenced one instance back in 2009, when Xavi won a penalty against his team in the Catalan derby, which Zlatan Ibrahimovic duly dispatched.
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'He cheated the referee,' said Pochettino. 'He fell down and it wasn't a penalty but Ibrahimovic scored and they won the game. On the video it was funny because no-one touched him and everyone in the media was saying it was a penalty. Come on, it was going from lie to lie to lie.'
Is this newfound brashness a result of Spurs' impressive Premier League campaign? Or is the stress of competing for top spot getting to Pochettino's head? Either way, Xavi knows how to get a reaction.