Celtic are back in action against Heart of Midlothian this weekend once the international break comes to an end. Several Bhoys have been in action for their nations over the last few days, but supporters will be glad to see the real stuff returning amid the Bhoys’ blistering start to the season. Making his senior international debut for Belgium against Israel last Friday, new Celtic signing Arne Engels has enjoyed quite a couple of weeks after joining the reigning Scottish Premiership champions from Augsburg on deadline day. Brought in for a record £11 million fee, the midfielder will be expec…