Paul Pogba has sealed his return to Serie A giants Juventus — drawing a line under a disappointing second spell with Manchester United.

The Frenchman, 29, walked away from Old Trafford at the end of last season having failed to agree a new contract.

After months of speculation, he has officially rejoined Juve on a reported four-year deal as a free agent. 

Before heading back to Italy, the World Cup winner could not resist firing a parting shot at the United hierarchy for failing to keep him at the Theatre of Dreams. 

Speaking in his Amazon Prime documentary, Pogba said: "My thought process is to show Manchester [United] that they made a mistake in waiting to give me a contract.

"And to show other clubs that Manchester had made a mistake in not offering me a contract.

"How can you tell a player you absolutely want him and offer him nothing?"

Confirming the second coming of the France international, a statement on Juve's official website said: "When we say goodbye after an intense adventure shared together, there is always a glimmer of hope that we will see each other again, sooner or later.

"With Paul, that is exactly what has happened. In 2016, our paths parted after four incredible years.

"In the meantime, his talent and power came to the fore when as an integral part of his national side he contributed to France’s World Cup 2018 triumph. 

"Although we parted ways, we never really forgot about each other and there is something ancestral in the call that after a thousand adventures eventually leads you back home. 

"Paul is back in Turin. He left as a boy and returns as a man and a champion. 

"But there is one thing that has not changed — the desire to write unforgettable pages of club history together once more. 

"Pogba is back and we couldn’t be happier."

While Pogba starred in France’s World Cup success, he failed to live up to expectations during his second stint at United. 

Having rejoined the club from Juve for £89million in August 2016, he could only help the Red Devils win the Europa League and League Cup during a largely forgettable stay in Manchester.