Tottenham have confirmed the appointment of Paul Mitchell as their new Head of Recruitment and Analysis.
Leeds United striker Nicky Ajose has joined Sky Bet League One side Crewe on an emergency loan deal.
The Latics are believed to have seen an opening offer knocked back by the Tykes earlier in the window.
Roberto Martinez is refusing to concede defeat in his efforts to bring Stones on board, though, and has returned to the negotiating table.
Wigan hope that improved terms will tempt Barnsley into a sale.
The Championship club are reluctant to part with a product of their academy system, but appreciate that interest is steadily mounting.
Wigan are not the only side to be tracking Stones, but hope they can tie up a deal for the 18-year-old defender before a rival enters into transfer talks.