New Arsenal signing Kim Kallstrom has injured his back in his first training session for the club and looks set to be on the sidelines for a prolonged period of time.

The club have not yet announced how serious Kallstrom’s injury is although there are reports he could be out for between two to three months.

The Swedish midfielder was drafted in as a deadline day loan singing from Spartak Moscow, drafted in to cover the injured Aaron ramsey and Jack Wilshere and the suspended Mathieu Flamini.