cahill has won four cups with the stamford bridge outfit since joining in january 2012 , including the champions league , but the england defender believes league glory would be his most testing achievement yet .
the reward is massive and when it is in touching distance of you , for me personally it would be amazing .
' cahill believes chelsea were taught some important lessons last season .
` we lost a good few points last year against teams we should be beating and i think that stuck in our heads .