During that season, Cardiff City would defeat Newcastle United in the third round of the FA Cup by a 2-1 scoreline.
Kenedy had an effort saved by Etheridge but Cardiff soon threatened again when Sol Bamba's header from a corner was scrambled clear.
The pair famously fell out back in 2006 when then manager of Liverpool, Benitez fielded a second-string side vs Fulham in the Premier League.
Unsettled Hayden was sent off in this afternoon's goalless draw against Cardiff City - and Kenedy's facing retrospective action for kicking out at Victor Camarasa.
The clubs will be meeting for the third time in Premier League play on Saturday. "I know this is the biggest move of my career".
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Neil Warnock's side began at a fast pace and nearly took the lead after seven minutes when keeper Martin Dubravka dawdled and Kenneth Zohore closed him down, only to see the ball ricochet to safety.
Looking back on that sour relegation, Warnock said, "I was disappointed in Benitez, I'll never forgive Benitez for playing what wasn't even a reserve team".
At this point, his feud with Benitez has next to no bearing on anything, and both men will only be interested in the match itself.
There's no simple solution to this and they'll likely be forced into a situation where things get pretty hard, but when have things ever been any different with Newcastle United Football Club?
"Everybody is spending big money on players, but will they all work out?" Newcastle have been able to add extra firepower in attack this summer, with Yoshinori Muto also in contention, which could be crucial to gaining points in games that they didn't last season.
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