Arsenal captain Laurent Koscielny has refused to travel on the club's pre-season tour in the US.
The 33-year-old France defender who would be out of contract at the end of the 2019-20 season is reported to be a target for French clubs- Bordeaux, Rennes and Lyon.Bordeaux have reportedly offered Koscielny a three-year deal.
"We are very disappointed by Laurent's actions, which are against our clear instructions," said Arsenal.
"We hope to resolve this matter and will not be providing any further comment at this time."
The central defender joined Arsenal in the summer of 2010 for a fee of around £10m.
He has played 353 times for the Gunners and won the FA Cup twice, in 2013-14 and 2014-15.
Last season, Koscielny played 30 times for the club in all competitions, including one appearance for the under-21 side in the EFL Trophy.
Arsenal had been in talks with Koscielny over his future since late last season and the club felt things were moving in a positive direction.
However, the 33-year-old returned from his summer break and asked to be released from his contract a year before it expires, which Arsenal refused.
Negotiations have been taking place over the past few weeks, without resolution.
On Wednesday July 10, Koscielny communicated his intention not to join the squad on their pre-season tour to the USA - and on arrival at the Gunners' London Colney training ground early on Thursday he confirmed this decision.
Koscielny's behaviour has stunned Arsenal officials, who were already looking to use the transfer market to strengthen the central defence but had no intention of parting with their skipper unless a suitable offer arrived.
As yet they have received no offers, but it is understood Koscielny has options lined up that would see him return to France if he was a free agent.