By Italy correspondent Gianluigi Carrozzini

Chelsea have had a £54.4million bid for Paul Pogba rejected by Juventus, Football Insider sources understand.

The Premier League champions have made a formal move for the midfielder this week after registering their interest in him earlier this year.

Chelsea contacted Juventus to table a Pogba bid of £54.4million but were informed by the Serie A club that he is not for sale this summer.

The offer is not only below Juve’s £65million valuation of the player but the Italian team are not interested in doing business for their prize asset so late in the window.

They have sold Carlos Tevez, Andrea Pirlo and Arturo Vidal in a major makeover of their first-team squad during the transfer window, and regard Pogba as essential to their defence of their Serie A crown and ability to reach the later stages of the Champions League.

The 22-year-old former Manchester United midfielder is one of the most coveted young players in the world and is being closely watched by Barcelona, Real Madrid, Bayern Munich and Manchester City.

The Chelsea Paul Pogba approach demonstrates the extent at which Roman Abramovich is willing to back Mourinho in the transfer market.

The London club completed the signings of Pedro and Baba Rahman over the last week following the team’s worst start to the season in 17 years.

Pedro joined for £21.2million from Barcelona and Rahman transferred from Augsburg in a £17million deal.

The pursuit of Pogba represents a significant statement of intent from billionaire owner Abramovich. Pogba is a long-time target of the Premier League club but it is doomed to end in failure until January at least.