Crystal Palace are demanding Manchester United pay record money for Aaron Wan-Bissaka.
United have already had an opening offer of £40m rejected.
Sky Sports says United will have to pay £70m for Wan-Bissaka after Crystal Palace named their price for the 21-year-old right-back.
Ole Gunnar Solskjaer is desperate to add young British talent this summer and the England youth international has emerged as one of his top targets.
And the Old Trafford are ready to step up their pursuit having already added Daniel James from Swansea this week.