Stafylidis, 24, becomes first addition since Paul Lambert's appointment as manager on Monday.
2017 SeasonAll times ET
Stoke say they expect to complete the loan signing of Greece defender Kostas Stafylidis within the next 24 hours.
Robert Lewandowski continued his fine scoring form to send Bayern six clear at the top of the Bundesliga with a 3-0 win over Augsburg.
Borussia Dortmund cemented top spot in the Bundesliga with their fourth successive win, seeing off Augsburg 2-1.
The German FA (DFB) fined the Augsburg captain €20,000 for unsporting conduct and imposed a one-game ban.
RB Leipzig coach Ralph Hasenhuttl refused to shake hands with Daniel Baier after the Augsburg captain made an obscene gesture toward him.
Striker Raul Bobadilla has rejoined Borussia Monchengladbach on a two-year contract after passing a medical.
Hamburg SV couldn't get past the German Cup's first round as VfL Osnabruck beat the Bundesliga side 3-1 on Sunday to repeat its 2009 feat.
Augsburg have signed Rani Khedira, the younger brother of Juventus' Sami, on a free transfer from RB Leipzig.
Borussia Dortmund overcame a traumatic week to retain fourth place in the Bundesliga by toppling Eintracht Frankfurt 3-1.
Hertha Berlin ended their losing streak and moved into fifth place in the Bundesliga with a comfortable 2-0 win over strugglers Augsburg.
Bayern Munich's seemingly unstoppable march towards a fifth consecutive Bundesliga title continued as they swatted aside struggling Augsburg 6-0.
Leipzig were held to a 2-2 draw at Augsburg in the Bundesliga on Friday, opening the way for Bayern Munich to extend their lead at the top.
Bayern Munich stayed five points clear on top of the Bundesliga after Carlo Ancelotti's 1,000th career game ended 8-0 against Hamburg.
Javier Hernandez scored twice in a 3-1 win for Bayer Leverkusen at Augsburg in the Bundesliga on Friday, easing the pressure on coach Roger Schmidt.
Mainz brought a run of four games without a win to an end with a 2-0 victory over Augsburg at the Coface Arena to climb to ninth in the Bundesliga.
Raul Bobadilla struck deep into stoppage time to snatch a 3-2 win for Augsburg over Werder Bremen, while Eintracht also won late in Bundesliga action.
Moritz Leitner left Lazio to return to the Bundesliga with Augsburg on Tuesday.
Bundesliga leaders Bayern Munich produced another uninspired performance but managed to win 2-1 at Werder Bremen.
Leipzig moved back to within two points of Bundesliga leaders Bayern Munich with a comfortable 3-0 win over Eintracht Frankfurt.
Augsburg have called off their search for a new coach by leaving Manuel Baum in charge for the rest of the season.
Borussia Dortmund drew their third game in a row as a Tuesday match against Augsburg ended 1-1 at the Westfalenstadion.