And Voller has stepped out to insist he has no intention of parting with the duo, regardless of the sum offered.
"We could have pocketed more than €50 million for both players had we sold them, but 'no' fell easy to us," Voller mused to Bild.
"We will achieve more with Bender and Schurrle than without them, as they have no equivalent substitutes. I am not afraid of having disgruntled players - these guys have a top character.
"I will say it again: both of them will be staying here."
Bender has been publicly courted by Bayern Munich after the Bavarians move for Athletic Bilbao's Javi Martinez failed, while Chelsea have been joined by Serie A side Inter in the list of clubs interested in Schurrle.
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