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Sancho joined Man United from Borussia Dortmund with big things expected following his prolific goal-scoring ways in Germany.
But he's failed to deliver, scoring just three goals in all competitions this season.
The England international has shown a glimpse of his talent, though has been unable to perform to the heights of his performances in the Bundesliga last season.
Ferdinand believes it's down to the lack of rhythm at Man United and a lack of identity at the club.
As a result, the former Old Trafford star reckons it's left the 21-year-old in a 'vulnerable position'.
Speaking on his podcast, he said: "The game played to his strength, the passing and movement, some rhythm in the team.
"If there’s no rhythm Sancho is not as good and effective. That’s what his problem’s been.
"The players have got to identify what he’s good at. Some thought he would come in and take the ball from the edge of his box to the goal. That’s not his game. He’s about rhythm, one touch passing, playing and moving and getting people off balance with a feint.
"He hasn’t been able to do that because the system at Man Utd has not worked yet. It’s left him in a vulnerable position.
"He joins another team that have got a locked down way of playing, a true understanding, a possession based team he thrives.
"Dortmund had a way of playing which was fundamental in allowing them to perform at their best.
"United have invested in some players, still searching for identity philosophy way of playing, makes it difficult for players coming in, let alone those that are still there."
Sancho scored in his side's FA Cup defeat to Middlesbrough and could be in action against Burnley tonight.