For Julian Nagelsmann, the World Cup squad is not yet set in stone, even after the March selection. Nevertheless, it will be difficult for VfB Stuttgart midfielder Angelo Stiller – who has once again been left out – to get back in the running."The door isn't closed," the national coach assured on Thursday in Frankfurt am Main during the presentation of the squad for the international matches in Switzerland (27 March, Basel) and against Ghana (30 March, Stuttgart)."This isn’t a World Cup squad selection just yet," said Nagelsmann at the DFB Campus. "Some players still have a chance to prove themselves, whilst others we already know will stay at home. We want a good mix of the core group who will play in the World Cup and some fresh new faces." New additions to the squad are Lennart Karl and goalkeeper Jonas Urbig (both Bayern Munich).However, the majority of the 23-man squad can be sure of their World Cup places. "With a certain core group, we no longer pay attention to their form on the day; we don’t react to every little dip," he emphasised. "Unless it lasts six weeks. The crux of the tournament is this: 14 or 15 players get 95 per cent of the playing time, the others get a few minutes – but that role must be filled with maximum commitment. It’s important for me to emphasise once again that this has nothing to do with a character description that could be interpreted negatively. Every person has certain character traits and is suited to certain positions.”Before launching into his lengthy explanation, Nagelsmann had been asked, among other things, about the absence of Angelo Stiller. During his monologue, he then went on to address the VfB Stuttgart midfielder directly. “He’s an outstanding footballer with immense potential and consistently good performances, but he’s up against Pavlo, whom I simply see as being a notch above,” said the national team coach, adding: “Especially when it comes to certain tactical aspects. I don’t see Angelo in the starting eleven, and so we simply decided to fill the squad places behind him differently.” In other words: Nagelsmann sees Pavlovic as a more suitable player for the role than Stiller. Perhaps because he is worried that Stiller might poison the atmosphere if he doesn’t play?Nagelsmann seemed to anticipate that such speculation might arise, which is why he immediately added that this should not be taken as a criticism of Stiller. Nor should people read "all sorts of things" into his words. Nagelsmann emphasised that this was "a decision in favour of another player who is in the squad for that reason". The question remains, however, as to why Nagelsmann did not simply stick to the sporting rationale. Stiller had already been left out of the squad for the previous training camp in November, following which some experts and those directly involved with Stuttgart criticised the decision. “I don’t know why. Quite clearly, we were very surprised,” said coach Sebastian Hoeneß, for example. After all, Stiller is “the key player” for Stuttgart.Instead of Pavlovic, the central midfield will be made up of Leon Goretzka, Felix Nmecha, Anton Stach and Pascal Groß. Nagelsmann will hand out his World Cup tickets in the second week of May. He must submit the final 26-man squad to FIFA at the start of June.Add GOAL.com as a preferred source on Google to see more of our reporting