Arsenal are set to open disciplinary proceedings against Laurent Koscielny after he refused to join the club on their pre-season tour of the USA, according to Sky sources.
The 33-year-old France international is out of the contract at the end of the season and it is understood he has asked to be released from his deal so that he can return to France.
The club said in a statement on Thursday: “Laurent Koscielny has refused to travel to the US for our pre-season tour.
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“We are very disappointed by Laurent’s actions, which are against our clear instructions.
“We hope to resolve this matter and will not be providing any further comment at this time.”
Koscielny remains an important player for Unai Emery. He appeared in 29 games for Arsenal in all competitions last season, starting 24.
In total, the France international has made 255 appearances for Arsenal in the Premier League, scoring 22 goals since joining from French side Lorient for £10m in July 2010.
Arsenal are due to face Bayern Munich in Carson, California on July 18 in the opening game of their pre-season tour.
That is followed by games against Fiorentina in Charlotte on July 20 and Real Madrid on July 24 in Washington DC.