Phillips returns to the Potters for a second season-long loan after last season's spell.
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The 20-year-old defender made 39 appearances in all competitions for Stoke last term.
"Being able to bring Ashley back to Stoke City despite plenty of competition is down to him loving his time here last season so much, and a lot of work that took place behind the scenes to make it happen," Stoke sporting director Jonathan Walters told the club website.
"To have him playing for us for another season is a significant coup."