The most annoying part of reguilons injury (if he misses time) is with him. He's gonna be the make shift fullback as a result. So the big benefit that he was supposed to bring to our midfield which I've been dying to see for us won't happen, but instead he'll be covering out of necessity to start his time here in the prem where he'll likely then have a very tough start up against tricky and fast wingers, then lowering his confidence while our midfield is still just not working. Basically.... can't afford to have others miss time, need him used where he can actually be a big plus.
Also I'm guessing he was nowhere near fit given he played just a few minutes, and the game was crying out for someone like him.