The Reds captain was speaking to the Official Matchday Programme when he revealed the ban in place.
This comes ahead of the second led of the Carling Cup semi-final with Manchester City that Kenny Dalglish’s side lead 1-0.
“It (Wembley talk) has got to be banned because we haven't made it there yet. Of course it enters your mind and you dream about it,” said Gerrard.
“That helps when it comes to motivation, but I don't think any of our players will be getting carried away or thinking we've already done the job. We know this is a big game and a tough game.”
It was Gerrard’s first half penalty that sealed the win at the Etihad Stadium in the first leg two weeks ago.
It was a hard fought game and Dalglish’s side were required to defend very deeply in order to protect their lead and take an advantage back to Anfield.
Despite being the favourites to walk out at Wembley in just over a month’s time, Liverpool are obviously unwilling to take anything for granted.
One thing they are confident of though, is their ability to make it through two-legged ties and feel experience of Champions League knockout stages will be extremely valuable.
This is something City as a club have not witnessed in the past and Gerrerd feels it may be a factor in deciding who goes though.
“I think experience is important, it always is. Especially when you have a lead in such an important two-legged fixture,” he added.
“We need to play to our maximum. We need every player to turn up and play well to qualify. We need to ignore the scoreline and go into this game trying to win it.
“I think if we're too negative and try to just protect the lead it could be very dangerous.”