Just over five weeks after Arne Slot's Feyenoord had lost a tight Conference League final by a goal to Roma in 2022, they suffered a 7-0 home defeat by Copenhagen in their first pre-season friendly. Some of the Dutch club's internationals were on holiday, seven of their starters from the final would leave that summer and Copenhagen were well ahead in preparations, but even so, the scoreline was bruising. It felt as if Slot had to start all over again.