Source: BBC Sport That's a nice counter-move by Arsenal to sign a veteran like Silvestre. He used to be one of the best defenders in the world, but all those injuries put him snuggly on the bench at Manchester United. He was basically wasting away. Arsenal can use him as a central defender or left back if they need to.
A really surprising move. And a bargain at £700k. That £700k could be worth it in experience alone. Maybe he could Mentor the younger defenders such as Traore and even Arsenal Vets like Clichy.