Chelsea have reportedly been left very unhappy with one of their Premier League rivals after a move between the two of them went down over the summer.
It has not become uncommon practice in recent transfer windows for the Blues to deal with some of their fellow elite sides when it comes to transfers.
They are notably paying some of Raheem Sterling’s wages during his time at Arsenal, with there perhaps a hope already that the Gunners will sign Sterling permanently.
The likes of Mason Mount and Kai Havertz have joined rival clubs, while arguably Chelsea’s best player, Cole Palmer, came from Manchester City.
The same has seemed to start taking place at youth level too. Over the summer, Rio Ngumoha made the switch to Liverpool.

Chelsea taking Liverpool to court over Rio Ngumoha
John Terry was notably gutted the Blues had lost Ngumoha, with many having a knowledge of his game recognising him as a seriously talented youngster.
It was reported Ngumoha was unable to see a pathway to the first team at Stamford Bridge, however Chelsea have not been left best pleased with how things have played out.
According to Mail Online Plus, the Blues are calling a tribunal in order to work out how much they are owed for the deal.
Chelsea academy losing faith in the club
One of their most promising players leaving the club is perhaps a sign of the mood surrounding the academy process at the moment.
Reports have claimed that Cobham staff and youngsters are not confident of a route to the first team, most likely down to some of their transfer activity since Todd Boehly and co took over the club.
They have made it a clear aim to go after some of the best young players in world football, with some of them set to join next summer.
There is plenty of excitement over the incoming addition of Estevao Willian, who is likely to be involved as soon as next season.
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