If you mean squad players, many players can get in. But for potential starters, its only Donna and Romagnoli for Milan, both can become top players in their position.
Locatelli is young and sound talent, but litterally nothing is special about him, he keeps the basics and does things alright. But potential starter for top club? Nah, he is mainly gotten chances for Milan simply because there options are that dire, he is getting benched by Sosa nowadays, says it all. D Sciglio is text book backup/rotation level player, will never think he is good enough to start for Juve unless shown otherwise, but yeah he is the most likely and most realistic of them.
And if Juve cant find someone better then Suso to sign, then we really given up as a top club.