Chelsea may end up spending well over £100 million on new signings this summer, with a new centre-back, full-back, midfielder and centre-forward already on coach Thomas Tuchel's list of priority acquisitions, but the biggest problem facing the Premier League club's new American owners cannot be solved by any kind of transfer fee. By confirming the departure of senior executive Marina Granovskaia, Chelsea have created a vacancy that could prove impossible to fill.
What happens on the pitch, and the players who dictate whether a team succeeds or fails, tends to dominate the attention of supporters and media alike, but there are times when key changes in the boardroom carry much more weight than the transfer of a star player.