According to Sky Sports News, Arsenal Football club are open to letting their captain Laurent Koscielny leave the club if their valuation of the player is met.

Koscielny who has one year left on his current contract with the Gunners refused to travel with the club on their pre-season tour to the United States of America, an action which has prompted the club to open internal disciplinary proceedings against the player.

It is understood that the Frenchman wants a return to his homeland and have asked Arsenal to release him from his current contract.

The 33-year-old center back, has been linked with a switch to Ligue 1 clubs Bordeaux and Lyon.

Koscielny joined Arsenal from Lorient for a fee in the region of £10m in 2010 and has made 353 appearances for the Premier League club, leading the side intermittently before being appointed permanent captain a year ago.

Meanwhile, Arsenal’s latest bid for Celtic left-back Kieran Tierney has been rejected, Sky Sports News understands.

Arsenal’s offer was worth in the region of £25m but it is understood Celtic were unhappy with the structure of the bid and want more cash upfront rather than in add-ons. A new bid is expected for the defender in the coming days.