The pandemic stalled any immediate partnership, but Lijnders kept in contact, and by last summer Häusler and Häntschke were attending Liverpool’s pre-season training camp in France.

There, Klopp made his prime set-piece exponent, Trent Alexander-Arnold, and penalty takers James Milner and Mohamed Salah available for Häusler and Häntschke to “experiment” and demonstrate their techniques.

Since then, Neuro11 has been officially on board with Liverpool, in effect, appointing their own “brain trainers”.

The results speak for themselves, with Klopp’s side scoring more goals direct from a set-piece than any other side in the Premier League.

Last Sunday’s emotional stress of a Wembley penalty shoot-out was the ultimate test. For all of Liverpool’s 10 outfield players and goalkeeper to score was a spectacular vindication of the impact of the club’s work with Neuro11, prompting Klopp’s most public namecheck.

“It’s actually a nice story,” Klopp elaborated during his press briefing ahead of Wednesday night’s FA Cup tie against Norwich. “All the players are really excited about it and it’s about bringing specific players before a set-piece in the right mindset by doing the stuff we do on the pitch.

“Everything gets measured – they are using neuro-science – and it’s incredibly interesting and incredibly important to us.

“It is a very interesting new chapter for us because it’s not only penalties. It’s about free-kicks and all kinds of set-pieces. Now they are a fixed part of our coaching staff. They are not here all the time – they are in Germany obviously – but they come over quite frequently.”