This is a monumental blow for Odegaard, Arteta, and Arsenal's hopes of winning silverware this season. The Gunners skipper is vital to the club's success and without him, a huge hole will be left in Arteta's team. The Norwegian scored 11 goals and bagged as many assists last season, so finding someone to fill his shoes will be a tall order. Nobody can unlock a defence like he can at Arsenal, who could be severely weakened going forward.