The 25-year-old is the subject of serious interest from Premier League champions Manchester City who have been linked with a £100million swoop.
The club have already broken their transfer record this summer with the £33m signing of Emi Buendia and former striker Thompson believes keeping Grealish would be a further show of their lofty ambitions.
“But keeping Grealish, considering the profile he has now and how heavily he has been linked with Man City, would be a big statement."
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