Tottenham consider late bid for £31million-rated Celta Vigo midfielder Stanislav Lobotka
However, he has a £31m release clause in his contract, however, and his club revealed last month that he wants to move on.
Napoli are also interested in his services.
Villa boss Steve Bruce said: “I don’t want to lose Jack and neither do the owners. We don’t want to lose our best players but it’s football and it might happen.
“The one thing we’re able to do is be in a much better bargaining position because now, if Spurs want to buy him, they will have to buy him at a premium that in the last few weeks they haven’t been able to get to.
“A football player always wants to play at the top. He’s a local lad who has done great.
“Ever since I walked through the door it’s always been about Grealish one way or another and continues to be here.
“He’s our best player by a distance and a very good player.”