When Benjamin Arthur arrived at Pittodrie on Wednesday night he could hardly have expected to be making his first start for Celtic. Fast forward to 10 minutes before kick-off and the on-loan Brentford centre-back was getting stripped and ready to replace injured Dane Murray in the starting line-up. "I wasn't expecting to start but as I soon as I found out, I just switched on," the 20-year-old told Sky Sports.