The 18-year-old officially completed his switch to Anfield in a deal worth up to €35m, potentially the highest fee ever paid for a goalkeeper under the age of 23, but will spend the 2026-27 campaign back on loan at Genk before reporting to Liverpool next summer.
Standing at 6ft 7in, Brughmans only made his senior debut for the Belgian club in April, and Liverpool beat competition from Real Madrid and Bayern Munich to secure his signature as a potential long-term successor to Alisson.
Thorup revealed he had already discussed the scale of the move with his young goalkeeper.
"Naturally, I've spoken to Lucca about his transfer," he told Het Laatste Nieuws. "We talked about the experience of going to Liverpool, and the involvement of his family and so on. Every player dreams of this, and suddenly — before you fully realise it — you're right in the middle of it. You need a moment to let something like that sink in."
The Genk boss said he was conscious of the pressure that comes with such a high-profile transfer, and indicated he and his goalkeeping coach would monitor Brughmans closely as the season progresses.
"Of course, there's a lot coming his way. He's in the spotlight because of the fee involved. I'll protect him at the right moments, because we mustn't forget that the role of Genk's first-choice goalkeeper is still quite new to him," Thorup said. "Steven Frederix and I will assess match by match whether we need to give him a rest."
Despite the magnitude of the move, Thorup said Brughmans had shown no outward signs of being overwhelmed since returning to training.
"Even though he's only 18, I can see that he remains calm and focused," he said. "He's already been back on the training pitch for a few days. The realisation that his life has changed will probably sink in sometime over the coming weeks."
Thorup also pointed to the wider benefit for Genk of producing a player of Brughmans' value, name-checking another of the club's recent departures to underline the point.
"The signings of Lucca and Kos Karetsas were particularly spectacular," he said, referencing the winger's move to Borussia Dortmund. "The club deserves a pat on the back for that. It also sends a signal: at this club, young players can make strides and eventually reach the European elite."