"No-one needs reminding what happened when United came to Villa Park at the same stage two years ago. The memory of losing after holding a two-goal lead still leaves a bitter taste," Ellis said.
"Although we are under no illusions it will be any easier this time, the fans can be rest assured our players will be intent on revenge."
Southampton, last season's beaten finalists, are at home to Newcastle today.
Both sides currently have 26 league points -- the same as Liverpool -- and the Cup represents their best chance of silverware.
Other potential banana skin contests see big-spenders Chelsea at First Division Watford, Portsmouth hosting Second Division Blackpool and another struggling Premiership side, Tottenham, taking on First Division London rivals Crystal Palace.
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