Celtic’s defence has enjoyed a solid few weeks and they have yet to concede a single Scottish Premiership goal in four matches. Cameron Carter-Vickers and Liam Scales have been Brendan Rodgers’ preferred central defensive pairing for the first quartet of Scottish Premiership fixtures this term, supported by Alistair Johnston and Greg Taylor on either side. Nevertheless, Auston Trusty will come into the picture soon enough after completing his £6 million move from Sheffield United last week. He remained an unused substitute in Celtic’s comprehensive victory over Rangers yesterday. Capping a fin…