Saints defeat 'lit a fire' under Celtic, insists Johnston

Celtic's league defeat to St Johnstone was a much-needed "wake-up call" according to right-back Alistair Johnston.Brendan Rodgers' side bounced back from defeat in Perth by hammering Kilmarnock at Celtic Park, and they now have the chance to exact revenge against the Saints in Sunday's Scottish Cup semi-final.Their defeat to the Scottish Premiership's bottom side led to Rodgers calling out his players for being "too comfortable" and adding that their mindset brought "concerns" to the manager.Ref