The Terriers kept their nerve in a thrilling penalty shoot-out win over Sheffield Wednesday at Hillsborough on Wednesday to book a place in the SkyBet Championship final against Reading.
Wagner said: “We will go to Portugal for a few days with the families and the children and we will prepare there before we come back for the usual training week.
“I think it makes sense because the gap is too long to keep the excitement high, so (it is important) to do something at the beginning of this long period.”
Wagner believes his players are built to perform on the biggest occasion after they once again showed their spirit to hit back from a goal down and take the Owls to a dramatic spot-kick finale.
In hauling them from their status as unheralded at the start of the current campaign, the German believes they have accrued the kind of experience which will help them pitch up at Wembley unperturbed by the pressure.
Wagner added: “I’m not worried about the occasion after what we’ve done this season and the experience they’ve shown.
“The biggest quality of the group is their character - they are always able to bounce back and they really trust and believe in what they are doing and are able to make themselves independent of what is around them.
“This is a high quality to be focused on themselves and this is why I’m not worried about Wembley - they will take the excitement.
“They will be nervous, of course, but they will have an idea and they will follow it up.
“They were nervous (at Hillsborough), and at St James’s Park and at Villa Park, but they knew what they had to do and they were focused on what they had to do. This is when you can use the excitement and the nerves.”
Town will write one of the Championship’s most remarkable chapters if they go on to earn a place in the top flight - and they will also become the first club to go up to the Premier League having finished with a negative goal difference.
The German set up Town’s equaliser which was turned into the net by Owls defender Tom Lees under pressure from Nahki Wells, and was instrumental in his side finishing the tie on top.
His performance will give Wagner plenty to think about as he finalises the starting line-up he hopes can lift the Terriers back to the top flight for the first time since 1972.
Wagner added: “I think he (Quaner) made a massive influence - he was very strong and active, he has been in very good form and it was the right decision for me to bring him from the bench.
“He did exactly what I expected. Even if he could only show it for extra-time he has been in very good form for the last six to eight weeks and he was able to show me that once again.”