Lyon striker Karim Benzema has a buy-out clause of 100 million euros, club president Jean-Michel Aulas revealed on Tuesday.
The France international agreed a new contract at the end of last season with the reigning seven-time Ligue 1 champions, tying him to the club until the summer of 2013.
The 21-year-old is one of Europe's most sought-after youngsters but anyone wishing to sign him will have to break the world record for a transfer fee.
"We made him sign a contract until 2013, with an exit clause of 100m euros," said Aulas, at a Lyon board meeting.
"His working contract does not include this clause, which would be illegal. It is a question of a contract 'sous seing prive'.
"The aim is to win the Champions League with Karim Benzema. It is a strong project, like the construction of a new stadium."
In French law, a contract which is 'sous seing prive' is one agreed in private by the parties involved.
Benzema was the top scorer in Ligue 1 last season with 20 goals, and he already tops the charts this season having found the net five times in six games.