Celtic are interested in signing Rennes defender Sacha Boey.

According to Le Parisien via GFFN, the Scottish giants have now formally opened negotiations with the French club regarding a summer move for the 20-year-old.

The Hoops were recently linked with a move for his teammate Brandon Soppy.

The two clubs are currently locked in talks regarding Boey, and Celtic have submitted an opening offer.

The 20-year-old has just one year left on his current contract, and the French outfit are under pressure to cash in on him this summer.

Rennes will not want to lose the player on a free transfer next year, and Celtic will be keen on snapping him up for a knockdown price.

The Hoops are in pole position to sign the defender, but there are several French clubs interested in his services.

It is no secret that the Hoops will need to add more defensive cover this summer, and Boey could prove to be a quality long term investment.

Boey is naturally a right-sided full-back, but he can also operate on the opposite flank.

His versatility could be useful for Celtic as they bid to wrestle the Scottish Premiership title back from Rangers.

Read: Celtic keen on 26-year-old international defender.