Mason Mount signing highlights Manchester United's own £126million problem

It's taken a while, but Manchester United have finally got their man. A month after agreeing personal terms with Mason Mount, they have now also agreed a financial package with Chelsea for his signature.

United have agreed a deal worth an initial £55million fee, with a further £5million potentially due in add-ons, for a player Erik ten Hag identified as a top target in the window.

He will sign a five-year contract with the option of a further year and be the club's first new arrival in the transfer window once he completes a medical when he returns from holiday next week.

It is certainly a step in the right direction as United go about the next stage of their squad rebuild, though it is well known that player sales will be crucial to fulfilling those ambitious summer plans.

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This is even more relevant following the deal for Mount, as Chelsea managed to secure a vast sum for a player who is otherwise out of contract next summer. United could certainly learn a lesson or two from their approach.

It is easy enough to say United must now sell their unwanted players in the transfer market, but it is a different thing to actually go and do that.

The deal for Mount takes Chelsea's sale profits to £765million over the last ten years, which is by far the highest in the Premier League. During the same period of time United managed just £126million.

United have a reputation for being a club that struggles to move players on, perhaps best demonstrated last summer when six senior stars left for free. They could have received a fee for Paul Pogba during his final few years and should have cashed-in on Jesse Lingard when his stock was high from the loan to West Ham.