straight to your inboxArsenal look to have been dealt a blow ahead of their Premier League clash with Manchester City.Gunners boss Mikel Arteta is set to be without key defender Kieran Tierney for the showdown at the Etihad on Saturday, October 17.Tierney is currently away on international duty with Scotland, who face Israel on Thursday in a crucial Euro play-off semi-final.But the Scots' preparations have suffered a serious setback with the news that Stuart Armstrong has tested positive for