Rangers hero Arthur Numan insists Calvin Bassey can't be allowed to leave Ibrox for any less that £20million this summer.
The defender has been strongly linked with a move away from Ibrox to join ex-boss Steven Gerrard at Aston Villa after an impressive end to the domestic and European campaign.
Away from Villa Park the 22-year-old is attracting interest from fellow English Premier League sides with a bidding war on the cards.