(ShareCast News) - Tesco will decide this week whether to call off the sale of Dunnhumby after nearly all the bidders withdrew from the sale process.Dunnhumby is the supermarket's data arm which utilises data gathered from its Clubcard loyalty scheme.All but one bidder withdrew from the process after financing concerns, according to Sky News.It's understood that Tesco's chief executive Dave Lewis will now meet with colleagues and advisers this week about whether to go ahead with the sale, or abandon the process.Sky News understands that marketing services giant WPP Group is the only remaining bidder.Shares in Tesco were down on the reports Tuesday morning, with shares sitting at 171.55p at 1522 BST, a 2.8% drop.