Vasilis Barkas ' self-belief will be tested to the limit at Celtic. The summer signing from AEK Athens has been placed under the spotlight following an unconvincing performance in the 2-0 derby defeat to Rangers at the weekend.
Barkas - a Greece international - was signed on a four-year deal in July for a fee of around £5million. But Gordon, who returned to Hearts for a second spell in the summer after six years at Celtic, believes the mental aspect of playing for the Premiership champions is crucial.
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