Chelsea may have one of the most well-stocked squads in Europe, but that doesn't mean it is faultless. With Melanie Leupolz on maternity leave, and Spence and Ji leaving, they are lacking a bit of steel in midfield.
This summer, they tried to bring in Paris Saint-Germain captain Grace Geyoro to fix that, but the French giants stood firm and rejected what would've been a world-record fee despite the player wishing to try a new challenge.
Hayes has got creative to try and strengthen the area, transforming tenacious winger Erin Cuthbert into a deep-lying midfielder in pre-season. It's not the only experimenting she's done, either.
Harder has dropped into "a bit more of a midfield role", as the Dane described it to GOAL, while captain Magdalena Eriksson looks like she will move from centre-back to left-back due to a dearth of options. The Swede is more than comfortable there, but she is certainly at her best in the heart of defence.
Will these positional changes be enough to address gaps in the squad? Only time will tell.