The Blues brutally tore into Martin O'Neill's men when the two sides clashed at Stamford Bridge a fortnight ago, running out 7-1 winners and destabilising Villa's assault on the top four.
Chelsea have high hopes of a domestic double, including defending the FA Cup they won so impressively under Guus Hiddink last season.
Rout: Chelsea's Frank Lampard celebrates the third of his four goals in the recent 7-1 thrashing of Aston Villa at Stamford Bridge
But Terry knows only too well the revenge attitude that will be coursing through Villa veins.
'The one thing that all us players have got to get out of our systems is the recent result against Villa,' the captain said.
'Before we beat Manchester United last weekend we talked about how determined we were not to let them do again what they did to us last time we went to Old Trafford, and it's 100 per cent certain that will be Martin O'Neill's approach.
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'I've spoken to Siddy [former Chelsea midfielder Steve Sidwell] since we beat Villa at Stamford Bridge and he was already talking about the semi-final.
'He told me that Villa were fuming over the way that they got beaten and the way they played.'
Villa could hardly have been any worse at the Bridge; a curious fact considering they had taken all three points in the season's earlier clash with Ancelotti's men.
And Terry expects Saturday's match under the famous Wembley arch to bare little comparison.
'It is going to be a totally different game,' he added. 'It is a bigger pitch at Wembley and they will probably have one or two more players back from injury as well, so we need to make sure when we go in to the game we forget what has happened recently and approach it the way we normally would.
'If we play the way we have been playing then we have got every chance on Saturday.'
Chelsea have experienced mixed fortunes at the national stadium. They won the first FA Cup in the new surroundings but have since lost in the charity shield and against Tottenham in the 2008 Carling Cup final.
'It feels like a normal game in the build-up during the week and then the nerves kick in just before kick-off,' Terry added.
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