Watford have asked about £25m-rated Nice winger Allan Saint-Maximin.
The 22-year-old, who has represented France at Under 21 level, is highly-rated and has a number of admirers in the Premier League.
Newcastle and Crystal Palace are both interested in the player and they will now face competition from the Hornets.
Officials in France have disclosed that Saint-Maximin will not be sold on the cheap after an impressive campaign in which he contributed six goals and five assists in all competitions.
The Frenchman came through the ranks at St Etienne, making his Ligue 1 debut at the age of 16.
He has also played for Monaco, Hanover 96 and Bastia.