Thomas Vermaelen recently suffered a back injury, which has kept him out of the club's pre-season tour to Asia.
A statement from the Arsenal website said: "The club captain has picked up a back injury and it has been decided that he will stay back at London Coloney to receive treatment from the Arsenal medical team."
With any injury, without receiving the correct treatment, complications could arise resulting in a long term absence. If the worst case scenario does occur and Vermaelen is out for a long period of time, then manager Arsene Wenger must delve into the transfer market and purchase another centre back.
An ideal candidate who could fill Vermaelen's position, should he develop a long term injury, is Swansea City's Ashely Williams.
Arsenal have been strongly linked with a £12m bid for the Swansea captain - a fee that Swansea should be delighted with.
Regardless of Vermaelen's injury, Arsenal should buy Williams anyway to increase the quality and strength of the back line.
With the transfer of Johan Djourou on loan and Sebastien Squillaci's release from the club, Arsenal could face the potential problem of starting the Premier League season with only two established centre backs.
One of Swansea's standout players in their Premier League era and captain of his country, there are only good things to say about the Welsh defender.
A quality centre back at the peak of his career, the traits that Williams possesses; being fast, agile, strong and authoritative makes him a perfect candidate to become a success wherever he plays.
If the rumours of a move to Arsenal materialises, then it will be a great addition to the team.
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