Koscielny injury could prompt Wenger bid for Williams
Arsene Wenger could be facing a defensive injury crisis after Laurent Koscielny limped out of training during Arsenals pre-season Asian tour in Japan.
The France international, whose brilliant end-of-season form was instrumental in helping the Gunners clinch the last Champions League qualifying spot, pulled up with an apparent ankle problem at the Mizuno Rugby Stadium in Nagoya.

Arsenal have yet to reveal the extent of the injury but anything serious would leave Gunners boss Arsene Wenger seriously short of central defensive options.

With Sebastien Squillaci released, Johan Djourou off on a season-long loan to Hamburg and club captain Thomas Vermaelen out for three months with a back injury, Per Mertesacker is the only experienced centre-half at manager Wengers disposal.
Arsenal have previously been linked with a move for Swansea central defender Ashley Williams, and a serious injury to Koscielny could hasten any bid for the Wales international.
Williams is valued at around £10million by the Swans.
In Koscielnys expected absence tomorrow, Mertesacker will likely be partnered by 20-year-old Spaniard Ignasi Miquel.
Goalkeeper Wojciech Szczesny is also ruled out of the game with a back injury.