CSKA Sofia defender Valentin Antov is being watched by Premier League clubs.
The Mirror says Arsenal and Manchester United have both sent scouts to watch Antov, according to Bulgarian sources.
The 19-year-old has attracted interest from a number of European clubs, with West Ham also believed to be monitoring his progress.
Antov has become a regular in the Sofia side, making seven appearances so far this season and providing one assist.
He is a centre-back by trade, but can also operate in front of the back four as a defensive midfielder.
Representatives of the interested Premier League clubs have flown to Bulgaria to watch him in action against Ludogorets on Sunday.