All things considered, West Ham have found themselves making a pretty good fist of things lately. Despite a recent spate of key player injuries, Pellegrini has found the formula to regularly get points on the board with his team.
This FA Cup tie against Birmingham will afford the Hammer's manager a chance to rest some of his more important players and give valuable game time to those needing it.
Here's how West Ham could line up.
1. Goalkeeper & Defenders
Adrian (GK) - Lukasz Fabianski has impressed greatly this season, but he should be allowed a rare rest as Adrian returns to the fray.
Pablo Zabaleta (RB) - Options are so short at the back, it doesn't look like there are many options other than to start the Argentine - despite the fact that he only just returned from sickness to play in the 2-2 draw against Brighton.
Angelo Ogbonna (CB) - With injuries playing their part once more of late, Ogbonna has started to feature more regularly. He may be required again for this one.
Reece Oxford (CB) - With options so short at the back, Oxford may get a surprise go at first team minutes against Birmingham. He's been linked with a move elsewhere for a while now, so it could be a chance to put himself in the shop window.
Arthur Masuaku (LB) - He's managed just one minute in the past three league games but should return to starting lineup for this one as Pellegrini shuffles his pack.
Grady Diangana (RM) - The talented winger has impressed often when given the chance this season; this may well be another opportunity for him
Mark Noble (CM) - The club's captain only came off the bench against Brighton last time out. His fresher legs may be required to steady things in the middle of the park for this one.
Conor Coventry (CM) - A bit of youth to match Noble's experience. Coventry may get a precious first team opportunity to show Pellegrini what he is capable of. He did make an appearance in the Carabao Cup earlier on in the season.
Samir Nasri (LM) - This could be the moment we are waiting for. It will be so interesting to see how Nasri's West Ham career pans out - this fixture may be where it begins.
Andy Carroll (ST) - As he slowly finds his way back to fitness, Carroll has managed 45 minutes in each of the last two league games. He may start against Birmingham - if so, he'll hope to get closer to the full 90.
Xande Silva (ST) - Having made his debut off the bench against Burnley recently, the youngster may well get another first team opportunity here.