Arsenal have lost star centre-back Laurent Koscielny to a calf injury ahead of a run of crucial games, Arsene Wenger has confirmed.
The Gunners are looking to bounce back from their 6-0 trouncing at the hands of Chelsea against Swansea tomorrow night but will have to do it without Koscielny, who will not be fit following an injury to his calf.
"We have lost Laurent Koscielny for Tuesday's game with a calf problem. I don't know how long he will be out for. He has a scan today [Monday]. Everyone else should be available," Wenger told Arsenal's official website.
It is another huge injury blow for Arsenal, who are already struggling to cope with a packed treatment room as it is. Jack WIlshere, Aaron Ramsey and Mesut Ozil are all currently sidelined with injuries while Theo Walcott and Abou Diaby remain long-term absentees.
Koscielny has been an almost-ever present figure for Arsenal this season, appearing in 27 Premier League games alongside Per Mertesacker. The pair established a strong partnership that long held the best defence in the Premier League before drubbings to Liverpool and Chelsea skewed the figures.
Although Arsenal go into Tuesday's game as favourites they then host Manchester City before travelling to Everton in what will be three crucial games for Arsenal. Not only do the Gunners have to re-establish a title challenge but they must also make sure they do not slip out of the top four.
The injury to Koscielny gives Arsenal captain Thomas Vermaelen a chance to regain his space in the side after playing second fiddle to his team mates for the past year.
Vermaelen's future at at the Emirates has been in doubt for some time as he enters the last 12 months of his contract. However, a spell in the first team will go a long way to convincing the Belgian international that his long-term future lies in north London.