The 33-year-old, who was linked to a return to France, refused to travel with the Gunners team for their pre-season tour in the United States.
Laurent Koscielny shocked the Arsenal by refusing to travel on the US pre-season tour.
The 33-year-old is keen to return to France after season nine with the Gunners, having joined a £ 9.7 million deal from Lorient in 2010.
The Evening Standard claims that Koscielny's request to be released from his contract – a year before it expires – was rejected by club officials, prompting him to move to AWOL.
In a brief statement, Arsenal said it was "very disappointed" with the actions of the team captain.
Below, talkSPORT.com lists six possible replacements for Koscielny.
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William Saliba (Saint-Etienne)
The Arsenal is believed to be about to conclude a £ 27m deal for the Saliba starlet in Saint-Etienne.
Unai Emery plans to return it to the French club, but that decision could change with Koscielny's uncertain future.
Saliba made 16 appearances in Ligue 1 in an impressive launch season 2018/19.
The eighteen year old could be an ideal substitute for Koscielny.
Gary Cahill (not assigned)
Arsenal has been linked to a summer move for Cahill, who is a free agent after leaving Chelsea last month.
The defender, who won all the major honors with the Blues, would have replaced the experience lost if Koscielny left.
Cahill insists he is still in shape despite starting only six games last season.
In May, talkSPORT said: "I'm fit like a violin and ready to go. I used the time when I didn't play wisely.
"This chapter will close and another will open for me without a doubt, so I still have a few years to play."
Krystian Bielik (Arsenal)
Bielik has more or less given to the Arsenal an ultimatum: Play or sell.
The Polish Under-21 international said it had no interest in returning to the Arsenal's Under-23 team and wants to continue playing senior football.
Bielik impressed in midfield and defended during a loan period with Charlton, helping Lee Bowyer's team win the promotion in last season's championship and then participated in the European Under-21 Championship.
At just 21 years of age, Arsenal could turn to Bielik, which is attracting Milan's interest, to address their defense problems.
Samuel Umtiti (Barcelona)
Umtiti has been struggling with injuries since playing a crucial role in the World Cup triumph in France last summer.
A knee injury, which required surgery, saw the Frenchman lose his starting spot for compatriot Clement Lenglet.
The arsenal was Umtiti's long-term admirer, who was connected with a big-money move to Paris Saint-Germain.
If it is in excess of the requirements of the Camp Nou, the Arsenal would be wise to make a move.
Eric Bailly (Manchester United)
Reportedly, the Arsenal had a rejected approach for Bailly in January.
Defender of the Ivory Coast was used sparingly by Manchester United boss Ole Gunnar Solskjaer, before a knee injury in April ended his season.
With the target centered against the Midfielder in this summer's transfer window, Bailly's Old Trafford days seem to be numbered.
While the Red Devils are unlikely to sell one of their players to a direct rival, Arsenal would offer Bailly a new start.
Toby Alderweireld (Tottenham)
Tottenham is unable to prevent Alderweireld from leaving if a club activates its release clause this summer more than two weeks before the start of the season.
The 30-year-old has a one-year leave on his contract and could leave for only 25 million pounds.
Last week, shock reports said Arsenal was considering a move for Alderweireld.
Given the financial restrictions of the Gunners, Alderweireld would have excellent value for money.
However, joining Tottenham's fierce rivals would not be good for club fans.
Alderweireld would be the first player to switch from Tottenham to Arsenal after the controversial change of Sol Campbell in 2001.
(tagToTranslate) Laurent Koscielny (t) William Saliba (t) Saint-Etienne (t) Toby Alderweireld (t) Tottenham Hotspur (t) Eric Bailly (t) Manchester United (t) Samuel Umtiti (t) Barcelona (t) Krystian Bielik (t) Arsenal (t) Gary Cahill (t) Chelsea