Koscielny has found games hard to come by this season having been an automatic first choice last term.
Per Mertesacker has established himself as first choice centre back alongside club captain Thomas Vermaelen, with Koscielny having only played four league games this term and racking up a total of 185 Premier League minutes thus far.
The Arsenal centre-back came in for criticism for his performance in the Gunners 2-1 defeat against Chelsea last month having been handed a starting spot by manager Arsene Wenger.
According to Tuttomercatoweb, Barcelona are ready to test Wenger’s desire to keep Koscielny at the Emirates Stadium by readying a £15 million bid.
Barcelona’s defensive problems were highlighted over the weekend as they shipped four goals in a 5-4 victory over Deportivo La Coruna on Saturday.
Both Carles Puyol and Gerard Pique are currently sidelined through injury while Javier Mascherano was sent off in the game at the Estadio Riazor, although his suspension has since been appealed against.
Were Koscielny to make the move from Arsenal to Barcelona he would follow in the footsteps of the likes of Thierry Henry, Cesc Fabregas and Alex Song.