Arsenal signed Spartak Moscow midfielder Kim Kallstrom injured.

The Mail on Sunday says Kallstrom, signed on loan from Spartak Moscow on deadline day, reportedly sustained a back injury playing football on a beach during his former side's winter break in Abu Dhabi last week - and he is now expected to miss at least six matches.

Arsenal boss Arsene Wenger is expected to reveal the likely length of Kallstrom's injury in the next 24 hours. The club have said that the problem was identified during the medical and that they chose to proceed with the transfer regardless because they are confident he will play an important part later in the season.