Dons winger Jonny Hayes says their previous good form will count for nothing at Hampden on Saturday.
Aberdeen face Morton in the semis of the Betfred League Cup at the national stadium as they bid to reach their second final in a little over two and a half years under manager Derek McInnes.
Aberdeen are seen as favourites to win the tie because they are heading for Hampden on the back of winning their last five matches.
But Irish winger Hayes claimed you are as well ripping up the form book when you play in cup semi-finals.
He said: “You can go into a semi on the back of five wins or five defeats, it makes no difference.
“It’s all about what the two teams do on the day.
“It’s 90 minutes of football with a massive prize at stake.
“The important thing is to make sure you deliver your best performance when it’s needed the most.
“We managed to do that when we beat St Johnstone in the semis in 2014.
“It’s vital we try to do that again this weekend.
“Morton are a good side and will be just as eager as we are to win in a one-off game.”
Hayes admits it is a still a comfort to be facing Morton at a time when the Dons are back to playing at their very best.
They beat Ross County 4-0 at Pittodrie at the weekend to stay second in the Scottish Premiership.
There have been a few grumbles about their league form, despite the fact the away defeat to Celtic is their only reverse so far this season.
Hayes said: “A lot of that was down to the fact people were making comparisons to the start we made last season, when we won the first eight.
“That was a record for the club, so no matter what we did this year it was likely we were going to fall a bit short.
“We are reasonably pleased with the start we have made.
“There were a couple of games where we didn’t play as well as we would have liked.
“Having a few players, including myself, out injured didn’t help.
“It’s better for the manager if he has a full squad to pick from.
“It gives him more options when it comes to formations and the ability to freshen things up when he feels the need.
“But we are happy we have managed to do enough to ensure we have only lost that one game.
“We are playing well at the moment and were very happy with the performance against County.
“It was great to win 4-0 – it could have been a couple more, and we played some nice football.
“We were well on top for most of the match.”