Neil Warnock is unsure if he will shake Rafa Benitez's hand when his Leeds United side host Chelsea in the Capital One Cup on Wednesday.
• Benitez to stay 'professional'
Warnock and Benitez fell out in 2007 when the latter, in charge of Liverpool at the time, fielded a weakened team against Fulham ahead of the Champions League final in Athens.
The Reds went on to lose versus Fulham and subsequently the Cottagers avoided relegation at the expense of Warnock's Sheffield United.
Warnock said at the time he was "very bitter" with the outcome while he outlined his hope that Liverpool would "never win another trophy under Benítez".
The Leeds boss said in the Guardian this week: "I've no idea whether I'll shake his hand. It was one of those things that disappoint you in life but you get disappointments and you have to get on with it.
"I haven't thought about shaking hands yet. But I don't think I should get into that because the last time I heard from Rafa he was threatening to sue me if I mentioned [the row] again.
"It was an email and I think it was his solicitor who was threatening legal action but I think it had Rafa's name on it. I've got it in a scrapbook at home."