Benfica have increased their asking price for reported Manchester United target Goncalo Guedes, according to A Bola.
The 19-year-old, who has also attracted attention from Atletico Madrid, is regarded as one of the most promising prospects in Portuguese football.
It was reported last month that he might be on his way to Valencia in January in a €25m (£22.6m) deal, but Benfica president Luis Filipe Vieira is now looking for a bigger transfer fee.
He is looking to sell Guedes in a similar deal to the one which took Renato Sanches from Benfica to Bayern Munich earlier this year.
Sanches moved for an initial fee of €35m (£31.6m), although that figure could eventually rise to €80m (£72.2m) if all add-ons are activated.