It always seems the case that our performance levels drop off around this time of year. Too much reliance on Fernandinho or falling back on players like Stones for the holding role, or Delph and Zinchenko for leftback slows our play down. Our game becomes less dynamic and more predictable. Teams can get a foothold against us.
Given the demands of our domestic season we need more youth and vitality (give Foden a few games!). For me Ndombele and Chilwell would be ideal. They could be the difference between major honours or not.
I don't see why the club should hold back. They're not the type of signings to send shockwaves through Europe but I believe they would make a significant difference.