Huddersfield Town’s new head coach David Wagner and his right-hand man Christoph Buhler go back a decade.

They met as players at German lower-league club TSG Weinheim.

Former USA international striker Wagner, now 44, was ending a playing career which took in spells at Eintracht Frankfurt, Mainz and Schalke,

Buhler, 38, was struggling with a shoulder problem which was to force his retirement.

He managed Weinheim before linking up with Wagner in the youth coaching system at Hoffenheim.

The pair, who will watch the Leeds United game before being officially unveiled on Monday, then worked together at Borussia Dortmund, where Wagner led the reserve side, who play at a separate stadium to the first team within the German league system.

Wagner, a close friend and former colleague of ex-Dortmund and now Liverpool boss Jurgen Klopp, became head coach of Dortmund II in July 2011, and in his first season, won promotion to the equivalent of League I.

Dortmund II played in 3 Liga until last season’s relegation.

Wagner recently left Dortmund II boasting a win percentage of 47 and saying: “Borussia are an extraordinary club with fantastic fans.

“In spite of that I seek a new sporting challenge after a great time.”

Kit Holden is a British football journalist who works in Germany and his seen plenty of Dortmund II.

“The general opinion of David Wagner is good,” he said.

“He had a really good first few years at Dortmund, getting promoted into the 3 Liga, where German football goes from regional to national.

“He also oversaw players like Jonas Hofmann and Erik Durm make the jump into the first team.

“Durm, of course, has since become a World Cup winner as well.

“He has a very good relationship with Jurgen Klopp.

“It’s interesting that Klopp’s decline at Dortmund came about the same time as Wagner’s, and for similar reasons. Dortmund II were error prone at the back last season, which is ultimately why they got relegated. They also had a number of red cards.

“But it’s tricky to gauge anything by results, because with these reserve teams, there are always caveats.

“If they’re successful, you can point to them being able to play top-level players from the first-team squad, for instance, Moritz Leitner, Leo Bittencourt and Matthias Ginter.

“If they’re less successful, you can say they tend to lose their best players to the first team.”

“Overall, Wagner is viewed fairly positively.

“He has a good attacking philosophy, and has been around great coaches for much of his career as both player and manager.”