Eintracht Frankfurt came from a goal down to draw 1-1 at home in a feisty match with Werder Bremen on Saturday as both sides finished a man down.
Mario Goetze toasted the career of former mentor Jurgen Klopp, who announced Friday he would step down as Liverpool coach at season's end.
Flick also selected uncapped duo Werder Bremen striker Niklas Fuellkrug and 17-year-old Dortmund forward Youssoufa Moukoko.
Mario Goetze, who was a free agent after Borussia Dortmund allowed him to leave, has signed a contract with Dutch club PSV Eindhoven.
Mario Goetze wrote himself into German football folklore by volleying home a cross during extra time in the 2014 World Cup final to seal a 1-0 win over Argentina.
Riyad Mahrez, the $75 million signing from Leicester, made his Manchester City debut while the precocious young English midfielder Phil Foden also started.
"I am in the process of getting treatment and I will do everything I can to get back into training as quickly as possible to help my team achieve our common goals," Mario Goetze said
Mario Gotze, who had won two back-to-back league titles with Borussia Dortmund, will return to the club three years after leaving for Bayern Munich
Slovakia, who will make their European championships debut in Group B alongside Wales, England and Russia next month, deserved their win in Augsburg as Germany coach Joachim Loew blooded a youthful quartet
Mario Goetze scored Bayern Munich's third goal while wearing the special boots -- embroidered with the hashtag '#refugeeswelcome' -- in Wednesday's 3-0 win over Olympiakos in their opening Champions League group-stage match.