A tough one this month - which is nice for a change. I suspect Sarr will win, but my vote is going to Masina, who has been mightily impressive.
I was watching Étienne Capoue during our game v Liverpool and he was amazing. His timing in the tackle, the ground he covered, and his ability to pass accurately left me in no doubt that he is a high class player when he really is in the right mood. He seems to be showing signs of real leadership at the back, and is kept busy translating for young Sarr. Like others he seems to be enjoying having Pearson here, but how can you choose just the one?