The Portuguese forward admitted recently that he misses his former manager and described him as his "father in football".
This prompted Sir Alex to talk of his continued admiration for the Real Madrid man but he described him as "unbuyable", having scored 165 goals in 162 games for Los Blancos.
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|11/1||Cristiano Ronaldo is 11/1 with Bet365 to score a hat-trick against Manchester City|
But Sir Alex jokingly told reporters that bringing Ronaldo back to Old Trafford is "a Christmas wish. We have them every year."