Remove Muric and Mangala.
Add Laporte and Zinchenko.
Grimshaw is fine as third choice goalkeeper. No need to use a foreign spot on Muric.
Assuming the Laporte deal goes through which looks very likely, i'd say we need Zinchenko to cover at left-back more than an additional centre-back. Stones, Otamendi, Laporte, Kompany and Adarabioyo seems good enough given that Walker, Danilo and Fernandinho could fill in there in an emergency. It's just a case of whether the club believes Kompany can stay fit enough to be of more use than Mangala. Personally, i'd omit Mangala. We're going to have to upset someone and he really looks to have no long-term future with us. Maybe we'll even loan him out for the rest of the season if someone will take him.
The only real other alternative i can see is to omit Mendy. Pep said he'd be back for the Champions League semi-finals and i presume that is still the case. Maybe he'll be physically able to play by then but how likely is it that he'll be sharp and match-fit enough to justify his squad place? Only the medical staff will really know. We'll be kicking ourselves if he gets back on form and we can't use him though. The same goes for Kompany. Either scenario still seems more plausible than Mangala developing into a composed, ball-playing centre-half over the next 3 months.