He told Sky Germany: "Everyone knows my contract. Now is not the time to talk about it. I'm definitely having a great time in Leverkusen and I feel good. The European Championship is 100 per cent on my mind right now. I don't care about anything else right now."
Kohler, who won the 1990 World Cup with Germany, believes Wirtz and Leverkusen team-mate Jonathan Tah could both be at Bayern soon.
"Bayern 's great strength has always been that they have the best German national players. I think Tah should make this move because as a player you always strive for the highest possible, even if he had a sensational season with Leverkusen. Florian Wirtz will be the next to sign for Bayern," he said.