January signings Oscar Cortes and Mohamed Diomande could make their full debuts for Rangers during Saturday’s Scottish Cup fifth round clash with Ayr United at Ibrox. That is according to Philippe Clement, the Gers boss weighing up whether or not to ring the chances against second-tier opposition, albeit one all-too keen to take on the role of David going up against the Glasgow Goliath with former Celtic skipper Scott Brown in the dugout. Clement confirms that Rangers will be able to call upon Ben Davies and Ryan Jack against Ayr United. There is also the ‘possibility’ of maiden starts in Scot…