The Celtic fans will be looking eagerly toward this summer in the hope that Brendan Rodgers can add quality players to launch his defence of the Scottish Premiership title and to improve the club’s standing in Europe. For the last three seasons, Celtic have failed to make a mark in the Champions League. And whilst dominating Scotland has been great, the fans are desperate to get back to the days when taking scalps like Liverpool almost became the norm at the beginning of this century. The one big position that Rodgers needs to address is the gaping hole that’s been left by Joe Hart. The retiri…