It doesn’t take a genius to work out that Celtic Park on Glasgow derby day or on Champions League nights creates the most intense atmosphere in European football. If not the most intense, then certainly in the top five. In fact no, if Lionel Messi believes it’s the best atmosphere in Europe for a football match then it has to be true. The likes of Cristiano Ronaldo and Xavi are in full agreement. And now, even Rangers favourite Graeme Souness has tipped his hat to Parkhead’s incredible atmosphere thanks to our club’s incredible fans. In fact, Souness has went as far as saying that Celtic Park …