The Swans had not received a spot-kick this season until the Canada-born Netherlands international was brought down in the box at Wembley by Bradford goalkeeper Matt Duke.
De Guzman subsequently fought off angry protests from Nathan Dyer, who hoped to take the set-piece in order to earn a cup final hat trick, before putting the Swans 4-0 up.
And, despite that controversy, Laudrup has revealed that the 25-year-old will take any future penalties the south Wales club win."Maybe we will go on a good run now and get another one on Saturday [against Newcastle]," he told reporters.
"I have a designated penalty taker. If Jonathan is on the pitch, he will take the penalty."
The Dane also called for his charges to quickly move on from their cup heroics ahead of the visit of Newcastle on Saturday.
"If you look at some of the sides we have to play, they all have something to play for," he added.
"Newcastle are not 100 per cent safe, neither are Norwich. West Brom are still playing for a place in Europe while Arsenal and Tottenham are going for the Champions League.
"We cannot stop being competitive because if we do we will lose all the games. It is part of being more mature; I am not saying we have to win six or seven of these games but we must keep being competitive.
"Look at last year when the team reached 39 points after some very good weeks, then suddenly lost five of the last nine, so we cannot stop competing, we have to go on."