When Oliver Glasner’s appointment as Nottingham Forest manager was confirmed, many wondered whether a potential reunion with one or two of his successful Crystal Palace squad might be on the horizon.But amid those immediate links with players such as Daichi Kamada, Adam Wharton and Jean-Philippe Mateta, it is another former player who Glasner is set to be reunited with more immediately.Xaver Schlager knows how Glasner operates, having played under him for two years at Wolfsburg. The midfielder was a big influence as the German club reached the last 16 of the Europa League, before subsequently qualifying for the Champions League with a fourth-placed finish in the Bundesliga.In February it was announced he would leave RB Leipzig — where he spent the last four seasons — at the end of his contract, as the player sought a fresh challenge.At the time he was linked with Italian giants Juventus and there has been significant interest in the 28-year-old since. But, while a deal with Forest has not yet been completed, he is expected to join up with the rest of the squad on their pre-season training camp in Portugal — after opting for a reunion with a head coach he knows well as part of a two-year-deal.So what is Schlager like and how will he fit into the Forest squad?Talk to those who have worked with him at Leipzig — where he won the German Cup and the German Super Cup, while making 81 league appearances — and they paint a picture of an unflinchingly honest character, with a traditional set of values. Schlager is somebody who will give a straight answer to a straight question, regardless of the topic.Oliver Glasner with Xaver Schlager at Wolfsburg in 2021 (Focke Strangmann – Pool/Getty Images)At Leipzig, according to sources speaking anonymously to protect relationships, he always put particular emphasis on respect and manners, which made him a strong, positive influence on the younger players at the club. Schlager was a key figure in helping academy players when they made the step up into the first team — he would teach them the value of always saying, ‘Good morning’ and being respectful to staff.