Olympique Lyon president Jean Michel Aulas is reluctant to lose Alexandre Lacazette this month.
The French striker is being linked with Manchester City and Liverpool.
Lacazette has scored 17 goals in 19 games this season and been watched by City scout Rob Newman on several occasions.
But Aulas argues: "You cannot put a sum on him (Lacazette). What is the name of the Welshman at Real Madrid? I believe that Alexandre is much better.
"But Alexandre has no price, so it is useless to think of one."