There was further speculation about the 24-year-old's future this weekend with reports of a near 50-million-pound bid set to be tabled by Manchester City.
However, Wolfsburg do not need to sell and Allofs reiterated that they have no intention of depriving themselves of Germany's Player of the Year, although at the same time he can relate with his player's open-mindedness.
"I think some other clubs have definitely turned Kevin's head," Allofs told Kicker magazine.
"Some huge figures are doing the rounds and I can understand why Kevin is leaving everything open.
"He's got to listen to the offers
I can't expect from him that he doesn't even want to entertain them."
However, the final decision rests with his club and Allofs has repeated over and over again that Wolfsburg are not willing to sell.
At the same time, he knows it is going to be difficult to keep De Bruyne in Germany for the remainder of his four-year contract.
"If he was only contracted to us until 2017, then yes, it would be different," Allofs told the Wolfsburger Allgemeine newspaper
"But let's be honest about it - it's highly unlikely that he'll stay with us right up until 2019."
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Source: PA