Claudius Fully agree. Tomiyasu is a good player but the team functions far less well without White, he's vital. He's also our best cover for Saliba, who's equally vital.
The biggest lurking risk with our thin defensive ranks is White already playing through injury and fatigue all the time. He dropped off worryingly in form after Christmas last season.
Love Trossard but I'm not too worried about Reiss or Smith Rowe failing to put in an effort, they know what the derby's about.