Celtic Park has always been heralded as one of the most unique atmospheres to play in across world football. Famously, the likes of Lionel Messi, Cristiano Ronaldo, and Samuel Eto’o have all waxed lyrical about playing in Glasgow’s east end in the past, especially when supporters pack out the stadium on European nights to generate a wall of noise [talkSPORT]. Granted, as a fan, results on the continent are the main concern for everyone involved; however, there is something special about Parkhead when it is rocking that many greats of the game have come to realise. Despite club football taking …