Arsenal and Manchester United sent scouts to watch 20-year-old striker Kaua Elias score a hat-trick in a pre-season friendly for Shakhtar Donetsk, while AC Milan and Porto are also interested in the Brazilian.

Chelsea are eyeing a move for 26-year-old Porto and Portugal goalkeeper Diogo Costa, who was previously linked with Manchester United and has a 60m euro (£51m) release clause.

Chelsea are monitoring 26-year-old Porto goalkeeper Diogo Costa as they consider moving for the £51m-rated Portugal international.

Arsenal are among several Premier League clubs linked with Porto midfielder Victor Froholdt.

As he prepares to leave Manchester United at the end of the season, Brazil international midfielder Casemiro, 33, has drawn interest from Inter Miami, Porto and Sao Paulo.