Mainz has rejected an offer from Nottingham Forest for centre-back Moussa Niakhate.

The newly promoted club made an opening bid of £9million for the Frenchman.

According to German outlet BILD, Forest have had their first offer knocked back.

The Bundesliga club are seeking a fee in the region of £13 million.

Niakhate has also been linked with a move to Everton, Newcastle United and West Ham United this summer.