The 25-year old centre-back has arrived at the Britannia Stadium from German club Bayer Leverkusen on a six-month loan with the view to a permanent deal.
Potters boss Mark Hughes was delighted with the capture of two-time Germany international Wollscheid who recently spent time on loan with Mainz.
"Philipp is a player we've been aware of and have been tracking for some time and he will add to the competition for places in the centre of our defence," Hughes told the club's official website.
"He's got presence, technically he is good, he has played at a high level and he has gone for big money in the past and to get a German international at relatively young age is a good deal for the club.
"He's genuinely excited about the prospect of playing in the Premier League and is confident of making a big impression as a Stoke player."
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