It is most likely because it will not be easy for Ivan Juric to continue what Gesperini has built in the last few seasons but I am sure Atalanta management is aware of this, they did not build a team with a lot of money to bring in many quality players so it is only right that Atalanta management should give Ivan Juric time to go through the process of building the team slowly.
Gesperini has been Atalanta's manager for a long time. It's probably 9 years. Atalanta hasn't won the title, that's right. But Atalanta is a team that doesn't spend a lot of money on building a squad. And even then, with Gesperini's help, Atalanta has been able to perform quite well. We have seen Atalanta perform well against every big team in Serie A. That's why I would say Gesperini is successful. He has been able to get a strong performance out of a mediocre squad.
It will be difficult for Ivan Juric to get a strong performance out of this squad. Ivan Juric is not very experienced coach. But I believe that Atalanta management will give Ivan Juric a long time. Atalanta is a club that doesn't want to change coaches too quickly. So Ivan Juric will be given time to prove his ability.
The good thing about Atalanta in the last few seasons is that they have been able to consistently compete in the top four of the standings, and the peak of Atalanta success was when they managed to win the Europa League trophy. Gasperini departure actually raises concerns, especially because he has been a manager for quite a long time, and his replacement Ivan Juric, is not a manager with a good reputation in Serie A.
Ivan Juric certainly needs time to adapt, his experience coaching several clubs in Serie A may help speed up the process. Gasperini left behind a pretty good squad, which can at least make Ivan Juric job easier in leading Atalanta to finish in the top four of the standings next season. It is possible that if Ivan Juric fails to create consistency, Atalanta management will fire him sooner than we expect.