How long before the past is buried – not forgotten, because that would be unforgivable and unrealistic – and you wake up feeling like yourself again, or, more accurately, like who you think you are or should be?

Rangers supporters will be wrestling with such feelings in the next few years as they ascend the league ladder. And, on Tuesday night at Parkhead against Juventus, Celtic may get a foretaste of what it will feel like when the Old Firm are finally reunited in the SPL.