One year on from captaining the club to a treble, Gundogan has returned to the Etihad.
Gundogan is also rumoured to be heading back to Manchester City, after spending a year with FC Barcelona.
Hungary coach Marco Rossi criticised the decision to allow Germany's opening goal as his side lost 2-0 to the Euro 2024 hosts in Stuttgart on Wednesday.
Germany coach Julian Nagelsmann said his side understood Friday's 5-1 thumping of Scotland in the Euro 2024 opener was just a "first step" for the tournament hosts.
Scotland coach Steve Clarke said his team had to quickly forget Friday's 5-1 rout by Euro 2024 hosts Germany in the tournament opener after admitting the "game ran away from us".
Germany will be hosting a major international tournament for the first time since the 2006 FIFA World Cup.
Kylian Mbappe, who is expected to be coming up against Barca in a Real Madrid shirt next season, has 39 goals for PSG in this campaign. Ousmane Dembele has only one.
Ilkay Gundogan stroked home a stoppage time penalty to grab champions Barcelona a barely deserved 2-1 win at Las Palmas on Thursday.
Five years after a photo with Turkish President Recep Tayyip Erdogan sparked questions over his loyalty to Germany, Ilkay Gundogan will captain the national side during Saturday's international friendly against Turkey in Berlin
Jude Bellingham's stunning double snatched Real Madrid a 2-1 comeback victory at Barcelona in his first La Liga Clasico on Saturday.