Grindel later said he should have given Ozil more support.
After playing in Sunday's game at Al Bayt Stadium, which Germany and Spain drew 1-1, Gundogan said he just wanted to focus on soccer from now on.
"Honestly, my point of view is: now the politics are finished," Gundogan said. "The country of Qatar is very proud to host the World Cup, also the first Muslim country, and I come from a Muslim family. So the Muslim community is proud. So I think now it's just about football."