It has been reported that Koscielny wants a new challenge after failing to agree on a new contract with Arsenal.
German club Dortmund, who will play in the Champions League next season, are interested in securing the services of the French central defender, according to the report.
Arsenal signed the 33-year-old from Lorient in the summer of 2010 for a transfer fee reported by The Independent to be worth £8 million.
It seems that Arsenal are looking to make a profit of £2.6 million on a 33-year-old who reportedly wants to leave, and it is not exactly a bad move.
Koscielny has been a good player for Arsenal over the years, but at 33, the Frenchman does need replacing.
The Gunners did not finish in the top four of the Premier League this past season and will not feature in the Champions League during the 2019-20 campaign.