The young centre-half was impressive for United's 1-0 win at Chelsea on Saturday.
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Heaven is in his second season with United, after being snapped up on a free transfer from Arsenal.
Ferdinand said on social media: "The recruitment has taken a battering at Manchester United over the last 10 years & rightly so.
"But we need to shout out Ayden Heaven - £1m! Still lots to learn but called upon once again and delivered!"
Ferdinand was referring to the traning fee United coughed up to Arsenal for the then free agent.