• Blues wary of threat of Arjen Robben and Franck Ribéry• Bertrand not in squad for group games, yet to play in EuropeRoberto Di Matteo is considering the radical move of handing Ryan Bertrand a first Champions League appearance in Saturday's European Cup final against Bayern Munich.The interim first-team coach is wary of the considerable threat posed by the German club's wingers Arjen Robben and Franck Ribéry, but has found his options limited by suspensions to four key players and a hamstring strain sustained by Florent Malouda against Blackburn Rovers last Sunday. The Frenchman returned to training only on Friday night, working closely wit...