Manchester United have begun negotiations that could see Paul Pogba return to Old Trafford, according to Sky sources

Which are the most credible Manchester United transfer rumours right now?

Sky Sports has teamed up with Football Whispers to bring you the most up-to-date transfer talk as Jose Mourinho looks to improve his squad ahead of the upcoming Premier League season.

Football Whispers have developed a unique algorithm to take all of the transfer rumours from across the globe and calculate the likelihood of them happening.

They track transfer stories and give them a score out of 5.0, with the hottest Whispers closest to 5.0.

Here are the top three:

1. Paul Pogba (Juventus) - 4.2

Paul Pogba once again tops Football Whispers' list for transfer rumours

Sky sources revealed on Thursday that Manchester United's executive vice-chairman Ed Woodward had begun negotiations that could see Pogba return to Old Trafford in a world-record deal worth £100m, underscoring Pogba's position at the top of the Football Whispers charts.

And despite Pogba's agent, Mino Raiola, saying initial talks with Real Madrid had taken place, and Sky Sports' Spanish football expert Guillem Balague adding that Madrid is the player's preferred destination, Sky sources understand that the La Liga giants are out of the race for his signature.

But there were further developments on Monday as the player's agent told The Times that the France international could end up staying at Juventus, adding another twist in this long and winding transfer tale.

Mourinho has just one of his four summer transfer targets left to pursue. Can the Portuguese prove his worth in the transfer market and convince Pogba to return to Old Trafford?

2. Cesc Fabregas (Chelsea) - 2.8

Jose Mourinho is ready to swoop for his old Chelsea midfielder Cesc Fabregas, according to the Daily Mirror

Jose Mourinho is ready to swoop for his old Chelsea midfielder Cesc Fabregas, according to the Daily Mirror.

That rumour has shot Fabregas up to second in the Football Whispers ranks, with Mourinho reportedly waiting to see if Fabregas is in Antonio Conte's plans for the new Premier League season.

3. Raphael Varane (Real Madrid) - 1.8

France international centre-back Raphael Varane has been linked with a move to Manchester United from Real Madrid

Raphael Varane is a long-term target for Manchester United and Jose Mourinho is a big fan following his time coaching the defender at Real Madrid.

However, Los Blancos have handed Varane the No. 5 shirt for the new season, hinting at a more prominent role that could halt any possible move to Old Trafford.

Hottest Man Utd whispers - Friday, July 15 Player Club FW rating (out of 5) Paul Pogba Juventus 4.2 Cesc Fabregas Chelsea 2.8 Raphael Varane Real Madrid 1.8 Toni Kroos Real Madrid 1.6 Reece Oxford West Ham 1.3 Nemanja Matic Chelsea 1.2 Blaise Matuidi Paris Saint-Germain 1.1 Moussa Sissoko Newcastle 1.0

Don't forget to follow the most up-to-date information around the clock with the Sky Sports Transfer Centre