The 26-year-old has been likened to Real Madrid legend Ramos by Germany World Cup-winning skipper Lothar Mattheus.
Mattheus told Sky Sports Germany: "Ginter has become a leader at the back, in a similar way to Ramos at Real.
"He doesn't just give instructions to his team-mates, but leads them as well. That's what Ginter is doing really well at the moment. He reminds me of Ramos."
Chelsea could grab Ginter for just £30m in January.