The involvement of Kieran Tierney was perhaps the most significant and satisfying aspect of Celtic’s comfortable Scottish Cup fourth-round victory over Albion Rovers on Sunday. No-one welcomed the 19-year-old full-back’s return to action more than Scott Sinclair as the winger resumed a highly effective partnership with him down Celtic’s left flank which has been partially forged in the unlikely setting of an oche at the club’s training ground.