The 22-year-old reportedly has a get-out clause in his contract which allows him to move at the end of the season if any club meets a fee of €35million (£28.5m).
The Blues are reported to have tried to sign the player last summer and are now being linked with a £12million offer plus Kevin de Bruyne.
But Voller remains relaxed about the situation and is not surprised that Schurrle is attracting interest.
He said in The Sun: "It's totally normal for there to be enquiries for such a great player, even from London.
"That's part of the business."