The Scotsman was sacked by United in April, with the then-reigning champions languishing in seventh place in the Premier League.
Ferdinand has claimed that Moyes spent too much time worrying about the opposition, rather than focusing on his own team's strengths.
In his autobiography #2 sides, which is being serialised by The Sun, Ferdinand said: "Before every game he made a point of showing us videos of how dangerous the other team could be.
"There was so much attention to the subject it suddenly became a worry. You heard a lot of guys complaining: 'I just don't know what he wants.' He had me doubting everything."
Ferdinand spent his final season at United under Moyes before joining Queens Park Rangers on a free transfer during the summer.