Manchester United are prepared to walk away from negotiations over Jadon Sancho due to Borussia Dortmund’s financial demands, the MEN understands.Dortmund are believed to be holding out for £108million for the England forward, who hit double figures for both goals and assists in last season’s Bundesliga.The MEN understands United are not worried about Dortmund’s apparent August 10 deadline for a deal to be agreed, and the English club is yet to reach an agreement with Sancho’s representatives,