Watford and Rennes remain in talks over the transfer of Ismaila Sarr, Sky Sports News understands.
Watford value the 21-year-old Senegal winger at £20m, although Rennes are thought to want closer to £27m.
Personal terms are not expected to be a problem for Sarr, who played for Senegal in the Africa Cup of Nations final on Friday night.
Any deal for Sarr would break Watford's record transfer fee of £18m - which they paid to Burnley for forward Andre Gray.
Watford also still retain an interest in Nice winger Allan Saint-Maximin for £25m, according to Sky sources.
Saint-Maximin, 22, scored six goals in 29 games in all competitions for the French side last season, as well as providing three assists.
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