It's true this was a panic buy from manchester united and I don't think we can fully criticize Erik ten hag's decision to sign Reguilon. That is much better than not getting a replacement for Luke Shaw when the competition is running early and if Erik ten hag wants to replace one of his players as a left back, of course it will increase the risk in every game. Manchester United is not used to being like Real Madrid, which can arrange its players when needed to fill empty positions. So whether Reguilon is a bad buy or not, I think Erik ten Hag has his own assessment and we'll see how things develop with Manchester United.
I don't think with panic buying from Manchester United after success signing Sergio Reguilón from Tottenham Hotspur with loan option, seems Manchester United want to get short term option for replacing Luke Shaw have got injured and have space position in left back. Actually Manchester United linked with Marc Cucurella but Sergio Reguilón have quit well performance and Erik ten Hag choose Tottenham Hotspur player until Luke Sshaw recovery from injury.
Participants in Champion League make Manchester United have preparing with solid squad, they won't loss opportunity with their player get injury actually when have busy schedule matches between domestic league and champion league.