Might seem reactionary, but I'd honestly sack Pellegrini. Leave the results, the performances have been absolutely shocking. All over the place defensively, but the attacking play has somehow managed to be even worse. They create nothing of substance.
He shows absolutely no inclination to change anything tactically, just keeps shuffling players around like that's the issue. After last week Pellegrini said "I have no idea why we played so bad", and his confusion shows on the pitch. Tough run of fixtures coming up and winless in 7. Not a good combo.
Also, Roberto is easily the worst top-flight keeper right now. Fabianski cannot get back soon enough.