After completing the signing of Lisandro Lopez from Porto last week, Olympique Lyonnais are believed to be interested in landing the Argentinian's former club-colleague Aly Cissokho.
The French giants are reportedly interested in having Cissokho replace ageing Fabio Grosso, having begun dialogue with the Dragons.
But, according to Football 365, Porto have rejected Lyon's €15m approach as they will only accept a bid that at least matches the offer lodged by AC Milan earlier in the summer.
The Rossoneri made a €15m offer which included a €1m bonus for every league title won during the duration of Cissokho's contract.
Lyon will now have to table an improved offer if they wish to sign Cissokho, who arrived at the Estadio do Dragao from Vitoria de Setubal in January for €300,000.
Luís Mira, Goal.com