Fernandes, 25, has been heavily linked with a move to Old Trafford from Sporting CP in January.
But there are contrasting reports over the status of a potential deal as United look to strengthen amid an injury crisis.
Manchester United are set to sign Fernandes for £60million (€70m) by the end of the week, according to The Sun.
However, the Daily Mail reports United are offering £50m (€58.4m) plus £10m (€11.7m) in add-ons and Sporting want £64m (€74.7m) up front.
Meanwhile, Fernandes has told Sporting he wants to make the move this month, according to The Telegraph, while reports in Portugal suggest Marcos Rojo could return to Lisbon as part of the deal.
Man Utd set to sign Bruno Fernandes by the end of the week.