Manchester United were linked with the England playmaker in the summer.
But Villa were able to tie down Grealish to a long-term extension.
And after a stellar start to the season, Villa are adamant the 25-year-old is now worth at least £100m.
Tottenham and Arsenal have also been linked with the Villa academy graduate.
Now the Midlands-based club have made it clear they won't be accepting anything less than their valuation.