Four English clubs have reportedly sent scouts to watch Toulouse centre-forward Martin Braithwaite in action over recent weeks.
The Denmark international has scored 24 goals in 102 outings for the Ligue 1 outfit following his arrival from Esbjerg in 2013.
According to the Daily Mail, that statistic has alerted West Ham United, Crystal Palace, Sunderland and Hull City.
The report adds that the 24-year-old, who has just over a year left to run on his contract, is valued at £4m.