Phillips, a 20-year-old defender, spent the previous season with Stoke and made 39 appearances in all competitions.
According to Stoke's sporting director, Jonathan Walters, the club was able to bring Phillips back due to his positive experience last season and the efforts made behind the scenes to secure the deal.
Walters considers the return of Phillips as a significant achievement for the club, highlighting the value of his contributions during his previous stint.