There was no hesitation in Matthias Jaissle’s response. Three weeks was all he would have to make an impression at Newcastle United before the Premier League began and, asked by the club’s hierarchy how he might use it, the 38-year-old gave a detailed and bullish answer. If the timing was brutal, he was not letting on.Jaissle’s enthusiasm and the vision he presented for where he could take the club and their young squad, which aligned with their new-look “Newcastle United 2.0” strategy, reassured — and wowed — executives during the secretive interview process which took place last month in Portugal where Al Ahli, his previous club, were training.The German would be required to “operate on rapid fast-forward” as one insider put it — speaking to The Athletic anonymously so they could talk freely, like others throughout — in an attempt to get Newcastle ready for Sunday’s opening fixture against Liverpool, but the meeting merely reinforced their thinking: “MJ” was their man.Jaissle knew the timescale was ambitious, that Newcastle were not going to be anywhere near their “peak” for Liverpool. For ‘Jaissle-ball’ to really become embedded, he requires a season at least, especially given the youthful transfer policy, yet there were no qualifications on his behalf.Eddie Howe’s decision to step down just as pre-season was commencing left Newcastle in a difficult situation, both because the pool of available managers had significantly diminished and because any new coach faced a shortened period to prepare a squad in significant flux.Jaissle had just under three weeks to get Newcastle ready for the new season (Stu Forster/Getty Images)Those inside the club now cite the serendipitous nature of events which unfolded. Had Howe left in May, Jaissle would not have been on their radar, given the coaches on the market. But after sifting through 178 names, senior figures became so convinced Jaissle was the right successor to Howe that they agreed to exercise the roughly €10million (£8.5m, $11.7m) buyout clause in Jaissle’s contract at Al Ahli — who are also part-owned by Saudi Arabia’s Public Investment Fund (PIF), Newcastle’s majority owners — to secure him.Even Premier League clubs rarely part with such a vast sum to sign an in-work head coach. Yet Jaissle was who Newcastle wanted and nothing that has happened since has led them to question their decision. As David Hopkinson, the club’s chief executive, told The Athletic recently, “We had a clear set of criteria of what we want. MJ fits every one and exceeds others we hadn’t even contemplated. This guy’s a born winner.”This is how Jaissle has used his rollercoaster first three weeks.On Tuesday, Jaissle stood in front of staff from across the club — including those in marketing, accounting, legal and building operations — at an internal ‘town hall’ at St James’ Park.During a 10-minute address, Jaissle spoke about how excited he was to be at Newcastle, how much this opportunity means to him, the “goosebumps” he felt when walking into the stadium for the first time, the warm reception and the energy he has felt since arriving and how keen he is to get going competitively on Sunday. He then undertook a brief Q&A session.That followed a letter he sent via WhatsApp to employees shortly after joining the club, introducing himself and stressing how valuable a role they all have to play.The new Newcastle boss gave a 10-minute address to all members of staff (Clive Brunskill/Getty Images)During his discussions with executives before agreeing to take the role, Jaissle referred to the “Newcastle Code” — the updated internal values which were rebranded by Hopkinson — and the club’s “DNA”, claiming he shares the same ethos and so felt he was ideally suited for the position.It is one thing making such gushing remarks in an interview setting, but figures inside the club have been impressed with how Jaissle is exemplifying that DNA in his daily interactions with staff and how he carries himself.The “one club” element of the code is said to be particularly important to the head coach, who it is claimed does not believe in a “cult of one”, and he has made a point of introducing himself to individual staff members (as well as the reporters present at his official unveiling).Soon after taking the role, Jaissle reached out to Howe, seeking intel from his predecessor, of whom he has spoken glowingly.