United made a late push to sign Dembele in the closing stages of the transfer window last week after failing to land Jadon Sancho from Borussia Dortmund.
Dembele, however, turned down the chance to join United and was intent on staying at Barcelona in order to win a place in Ronald Koeman’s side.
United and Barcelona also ran out of time in negotiations as the Premier League side wanted to sign Dembele on loan with a purchase option, while Barca’s preference was to permanently sell the French winger.
According to Sport, Barcelona’s stance remains unchanged and the club will be open to offers for Dembele in the next transfer window and are willing to sell for an initial €50m (£45m) fee.
The report claims that Barca want Dembele to renew his contract, which would increase his valuation, but if the 23-year-old refuses then the club will look to offload him permanently.
Barca had been holding out for €100m (£90.6m) fee for Dembele a few months ago but the Spanish club have been forced to drastically cut their asking price.
Dembele has less than two years remaining on his current deal and Barca do not want the player to enter the final year of his contract without signing a renewal.
Barca’s hierarchy are reportedly annoyed with Dembele over his refusal to join United as the decision ended up scuppering Memphis Depay’s proposed move from Lyon to Camp Nou.
A move for Dembele to the Premier League could now be on the cards in January, with Liverpool also expressing their interest in the winger during the summer.