Manchester United will reportedly have to come up with an offer of €27m (£25m) in order to sign Porto defender Alex Telles before the end of this summer's transfer window.
United are said to be reluctant to pay over the odds for Telles considering that the 27-year-old's existing contract in Portugal is due to expire next summer.
However, according to Correio da Manha, the 20-time English champions will need to make an offer of €27m (£25m) in order for Porto to sanction a sale.
Meanwhile, it is alleged that Telles's former club Galatasaray are entitled to 10% of a transfer fee, meaning that Porto are facing missing out on a quarter of what United pay if the deal goes through.
The South American has reportedly already agreed terms on a five-year contract at Old Trafford.