Manchester United are reportedly leading the race for Porto goalkeeper Diogo Costa.
According to A Bola, Costa will leave Porto this summer and United are the favourites to sign him, although Chelsea and Newcastle are also in contention.
David de Gea has agreed a new deal with United but it has yet to be signed off by the club's hierarchy.
De Gea has been in talks with United over a contract that would reduce his current salary of £375,000-a-week.
Even if de Gea stays, Erik ten Hag's side are eager to bring in another goalkeeper to compete with the Spaniard.