Borussia Dortmund asked Manchester United for youngster Mason Greenwood in talks to sell Jadon Sancho, MySportDab reports.
According to ESPN, The Bundesliga club wanted Greenwood last season but a deal failed to materialise with the youngster signing a new long-term contract at Old Trafford.
Manchester United refused to sell one of their future key players and due to this transfer talks collapsed.
Sancho will now have to decide between signing for Manchester United and Real Madrid after the 20-year-old ruled out signing for Chelsea.
The former Manchester City player is valued at £100million and now expected to leave Borussia Dortmund once the transfer window reopens this summer.
Last season, Sancho scored 17 goals and provided 19 assists for Borussia Dortmund in the Bundesliga and the Champions League.
MySportDab understands Sancho will now choose between Old Trafford and Los Blancos having ruled out joining Chelsea.
United are prepared to pay any fee to bring the former City player back to Manchester and remain interested.
But Real Madrid are also still in the race, though they would offer Dortmund a player + cash deal to reduce the transfer fee.