Warnock, the Leeds manager, is unsure whether he will shake Benitez's hand before Wednesday's Capital One Cup quarter-final at Elland Road due to a dispute between the two dating back to 2007.
The acrimony erupted after Benitez selected what Warnock perceived to be a weakened team in Liverpool's penultimate game of the Premier League season against Fulham at Craven Cottage.
Fulham won and United were relegated, prompting Warnock to declare he would "never forgive" Benitez, whose legal team later sent an email warning of possible action through the courts were he to be mentioned again.
The Spaniard is willing to shake hands on Wednesday evening in an effort to avoid controversy, but pointed out to Warnock that survival is determined over the course of the season.
"Every person has their ideas of each other," Benitez said.
"I'm professional and will try to do my job and won't be involved in anything, but what I will say is that the league is 38 games and not just one match.
"I'm professional so I won't have any problem (shaking Warnock's hand). There will be a lot of people watching us, so we have to behave.
"I saw that he said he has an email from me threatening to sue hum, but I don't remember. It's true, but I didn't remember it.
"I will concentrate on my job and hopefully we can talk about football, which is best for the fans and everyone. We need to leave things on the pitch."