Manchester United have been told that it will take a bid of €27million for Porto to sell Alex Telles this summer, according to reports.

With less than two weeks left of the transfer window, United are still working on adding to their single signing of Donny van de Beek before the October 5 deadline.

M.E.N. Sport understands that the club have stepped up plans to strengthen their defence following the humbling defeat to Crystal Palace on the opening day of the season, with it being accepted that a new left-back is now more of a pressing concern.

United had been monitoring Sergio Reguilon but opted against making a move after it became clear that Real Madrid wanted a buy-back clause inserted in any deal, with the Spaniard instead joining Tottenham.

Telles has since been identified as an alternative, and the Brazilian would bring a new attacking dimension to United as he has 26 goals and 56 assists in 193 games for Porto.

Although the 27-year-old is in the final year of his contract, the Portuguese club aren't - according to Correio da Manha, via SportWitness - prepared to let him leave on the cheap.

It's reported that Porto are set to miss out on 25 per cent of any fee they get for Telles, with 10 per cent going to his former club Galatasaray and 15 per cent being split amongst the agents involved in the deal. As a result, to get the desired fee they want, Porto are demanding €27million for the left-back.

The report adds that Telles has already agreed personal terms with United but his club's demands are delaying the deal. United are also understood to be monitoring Dynamo Kiev's Vitaliy Mykolenko.

Meanwhile, Barcelona wide man Ousmane Dembele is reportedly Manchester United’s ‘Plan D’ amid struggles to sign Jadon Sancho.

Spanish media outlet AS have claimed Barca are not considering the player to head out on loan this summer, though it’s been reported they may consider a sale for a €100m fee.

Dembele is not understood to be a target for United but David Brooks, Douglas Costa and Ivan Perisic have been considered as alternatives to the Borussia Dortmund star.