Rio Ferdinand has warned Manchester United over the possibility of another embarrassing defeat this weekend at the hands of Man City.
Ole Gunnar Solskjaer's side had to come from behind twice to earn a point against Atalanta in midweek, quelling any doubts about their qualification to the Champions League knockout stages with a dramatic 2-2 draw.
Cristiano Ronaldo scored both goals, including a 91st-minute volley, to claim an invaluable point in the hostile Gewiss Stadium after Josip Ilicic and Duvan Zapata put Gian Piero Gasperini's side in front in both halves.
Adding to their injury woes, Raphael Varane was forced off in the first half making him a potential doubt for the Manchester Derby after Victor Lindelof missed the trip to Bergamo
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