Matthias Jaissle says he has inherited a ‘vacuum’ of leadership at Newcastle United as he called for new signings and time ahead of what he has labelled a ‘transition’ season.The 38-year-old German was unveiled at St James’ Park on Tuesday after replacing Eddie Howe, who stood down this month amid concerns over the campaign that awaited.Newcastle have sold captain Bruno Guimaraes, star players Sandro Tonali and Anthony Gordon and lost Kieran Trippier since the end of last season. The five incomings so far have no Premier League experience and four are aged 20 or under.Jaissle wants to add experience – a deal for midfielder Pierre-Emile Hojbjerg fell through this week – and he was pressed on the club’s loss of four senior players, leaving the squad looking light less than two weeks out from the visit of Liverpool in the Premier League opener.‘We are in that transition phase,’ he said. ‘The players who have left were great characters, great players, experienced players. This is now a vacuum. We have to adjust something in the squad by signing these profile of players, or other players need to step up and fill these positions and these leadership roles.‘We are aware of what we need and the squad that we want. Internally, everyone is aware of that, and we are working on the solutions.’ New Newcastle manager Matthias Jaissle has warned the club are in for a ‘transition’ seasonHowe’s remit last season was European qualification – the team finished 12th – but Jaissle would not commit to what the hierarchy have asked of him this term, insisting the rebuild needs time.‘This will not happen overnight, especially when you now have such a big transition phase,’ he said. ‘You need to have a clear goal of where we want to go to. Then, if you have that synergy with the fans, the players and the staff to go there, then I’m pretty sure it will be a successful story. But we need time now. We can only do our best day by day, breaking it down with the goal long ahead.‘We are ambitious. But it makes no sense to promise you anything, because I don’t know how things look in half a year or one year. What we can control, we will control. Cutting the tasks down on a daily basis, doing the best job, and then we go in the right direction – and that is going to be successful.’