Transfer Rater: Yerry Mina to Manchester United, Jack Grealish to Chelsea

Things change in the blink of an eye in football. The Football Whispers Index takes the latest transfer rumours and gives them a score out of five; the higher the score, the more realistic and reliable the Whisper.

Here are today's top five emerging whispers. And keep an eye on Transfer Talk for all the latest gossip.

Jerome Boateng to Paris Saint-Germain

He didn't have the best World Cup, but Boateng is still a Paris Saint-Germain target, according to ESPN. Bayern Munich chief Karl-Heinz Rummenigge insists that "no contact" has been made for the Germany international, but did confirm that the player's agents are talking to the French champions over a transfer.

Yerry Mina to Manchester United

Jose Mourinho has been frustrated in his efforts to sign a centre-back and has now turned his attention to Mina, according to the Mirror. Mina is deemed surplus to requirements by Barcelona despite only joining in January and could become a Manchester United signing after targeting Toby Alderweireld and Harry Maguire.

Lewis Cook to Tottenham

Tottenham have yet to make a single signing this summer, but they could spend £30 million on Cook, according to the Daily Star. The Bournemouth midfielder would give Mauricio Pochettino another option in central midfield, but the Cherries are ready to put up a fight in an effort to keep the England under-21 international.

Moussa Marega to West Ham

West Ham have embarked on a transfer spree this summer and now they are in talks to sign four Portuguese Primeira Liga players including Marega, according to Sky Sports. Yacine Brahimi could be included in any deal struck with Porto, with Joao Felix and Xande Silva also transfer targets for Manuel Pellegrini. Representatives from West Ham are in Portugal to seal deals.

Jack Grealish to Chelsea

The England U21 international is a Spurs target, but Chelsea could hijack the deal for the Aston Villa midfielder, according to The Sun. A £20m move for the 22-year-old could be given the seal of approval from John Terry, who spent last season playing with Grealish at Aston Villa.