Who is Leon Goretzka's girlfriend?

Aston Villa and Germany footballer Leon Goretzka is reported to be in a long-term relationship, although neither he nor his reported girlfriend has ever publicly confirmed it. German celebrity outlets say the pair have been together since around 2015, and she is reported to have been photographed in the stands at several of his games. They are said to keep the relationship out of the public eye, and no engagement, marriage or children have been reported.