Trialist - the mysterious name on countless team-sheets with the seemingly infinite career.Where will he pop up next?Celtic haven't named too many, if any, in full matchday squads down the years but there's a fair few memorable names gone under the microscope at the club's old Barrowfield base and its current Lennoxtown complex.Some, of course, like Stan Varga earned deals - but what about the rest?Plenty disappeared into obscurity and plenty went off to make a name for themselves elsewhere.Here, looks at 15 you may just have forgotten about.The decision to offer the French midfielder an opportunity was a controversial one, given he'd infamously spat on John Hartson while playing for Celta Vigo during Celtic's run to Seville in the UEFA
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