The gloves are off, it seems, as Real Madrid and former Liverpool manager Rafael Benitez has responded to comments made by Sam Allardyce recently over his contribution to the Reds' stunning Champions League triumph in 2005.
The pair were never exactly the best of friends, of course, emphasised by their long-running feud during Benitez's tenure at Anfield and Allardyce's time as Bolton Wanderers manager.
But Allardyce, now in charge at Sunderland, took time in his new autobiography to renew past disputes by claiming that the 55-year-old played no part in arguably Liverpool's greatest achievement as a club.
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He said: "Of course he can say he's won the Champions League with Liverpool, which is something I never did, but it were nowt to do with him."
Harsh words from Big Sam - and surely debatable given the inspirational presence managers have in the dressing room.
Benitez, though, has responded in similar fashion. The Spaniard spoke to Spanish radio station Onda Cero about the issue, mere hours after admitting he was interested in signing Gareth Bale whilst in charge on Merseyside.
The ex-Chelsea manager said, as per the Independent: "Do you know who Sam Allardyce is? Do you know how many trophies he has won? Well, that's my answer.
"It is what happens when someone has a book to sell. His opinion does not have a lot of value."
In short, an insinuation from Benitez that due to Allardyce's lack of success, he must rely upon such controversial comments in order to sell.
And perhaps that's a fair evaluation, because regardless of how majestic and heroic Steven Gerrard and co. were on that night in Istanbul all those years ago, few can deny that Benitez played a large role in rallying his dismayed squad at half-time and spurring them on to victory.
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