With the transfer window opening less that a week away, the Celtic fans will be eagerly watching the business that will inevitably happen at the club this summer. The majority of the headlines have been taken up with Celtic’s search for a new goalkeeper over the past few weeks. While that does remain a priority for the club, there are other positions that need strengthening if Brendan Rodgers hopes to make a serious fist of next season’s Champions League campaign. And one rumour that continues to do the rounds is the possibility of Kieran Tierney returning to Celtic. Arsenal would accept £10m …