A word of warning Rangers; the Celtic side who will travel to Ibrox on Sunday is ‘stronger’ than the one which defeated their Old Firm rivals during their previous trip across the city in September. That is the view of Andy Walker, the former Hoops hero feeling that, after a January window in which Brendan Rodgers brought in Adam Idah and the increasingly-effective Nicolas Kuhn, Celtic can travel to the blue side of Glasgow with a better crop of players than they had six months ago. Then again, you can say the same of Rangers. Philippe Clement’s title challengers also made excellent use ofthe …