France’s U-21 international is a target for free spend Chelsea which Graham Potter takes cover for Reece James.
Gusto is said to have already agreed personal terms with The Blues and wants to move to Stamford Bridge this month.
However, the Ligue 1 club wants to keep Gusto for the rest of the season, even if he is loaned to Chelsea after the sale.
Lyon chairman Jean-Michel Aulas has stressed that the 19-year-old cannot leave, but Chelsea can. thought not to have been deterred by such commentsespecially considering the history of the French side when it comes to selling key players.
Gusto, an attacking right-back who shares the same athleticism as England international James, has 18 months left on his contract, meaning time is running out for Lyon to enforce something approaching maximum value.
Still, they stick to their position.
Blanc said on Friday: “The board has guaranteed that to me [Ryan] Cherki and Gusto will stay here until the end of the season.”