One football agent thinks Chelsea could end up completing one of the biggest deals of the summer. However, he has claimed that Chelsea will have to sell players before getting it over the line. The Blues have already been busy during this transfer window, recently confirming the signing of Kiernan Dewsbury-Hall from Leicester City. The midfielder joins Marc Guiu, Omari Kellyman and Tosin Adarabioyo at Stamford Bridge. Chelsea have also snapped up Estevao Willian from Palmeiras, but he will not be able to link-up with the team until next year when he turns 18. The next thing on Chelsea’s agenda…