I thought that Modric would either decide to end his career or go to Saudi Arabia or MLS. But his choice probably surprised many fans, he decided to continue playing in Europe. I think the reason was that he feels that he still has the strength to continue playing, but at the same time he already sees that he spends too much time on the Real Madrid bench, and this does not suit him, because he does not have much time left when he will have to end his career as a player. In Milan, he will have a place on the field, I think this is another reason.
He could have chosen the Arab League or MLS, but Modric says he sees AC Milan as being as historic as Real Madrid, so he considers AC Milan the right club to join after his departure from Real Madrid. moreover, AC Milan’s current position is not strong enough, and that is what motivates Modric to help the club regain its former glory. It is not an easy task, but at the very least, he still has the spirit to compete at the highest level and contribute in a meaningful way, rather than simply enjoying the end of his career in a comfort zone.