COGITO, ergo sum. Three words which came to define Western philosophy in the face of modern times during the Enlightenment. For Celtic, holding onto that edict – however outdated and superseded it has become – can prove fruitful in their endeavours at the elite level of European football. For if Brendan Rodgers is to achieve his objective of progressing in European competition, the Celtic manager perhaps has to start from the position of thinking primarily as a European club, and letting go of his reputation as a domestic tsar – in cup competitions at least.

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