In recent years, there have been several cases of players developing on loan at a club regularly. For example, look at Chelsea. During the 2010s, they had a partnership with Vitesse, where it felt like every decent youngster headed to the Netherlands to develop.
Zambo Anguissa has been a cornerstone of midfield under Luciano Spalletti and now under Antonio Conte. He has informed Napoli that he does not wish to renew his contract, which expires in 2027, meaning he is set to leave this summer.