Arsenal are open to letting Laurent Koscielny leave the club provided their valuation is met, Sky Sports News understands.

The Gunners have opened internal disciplinary proceedings against Koscielny after he refused to travel on a pre-season tour to the United States.

Koscielny has one year remaining on his contract and wants to be released for free and be able to return to France.

Speaking after Arsenal’s 3-0 win over Colorado Rapids, Unai Emery said: “For me as a coach Koscielny’s an important player. Now it’s a matter for him and the club”.

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