It turns out that M'Voto went into the game with the injury which got worse as the first half wore on.
Sankofa replacing him at the break at right back, with Simon Francis moving into the middle.
Johnny Herd went off four minutes into the second half where he was replaced by the new loanee from Wolves George Friend, who luckily plays in the same position at left back.
Blues boss Steve Tilson explained to the Echo: "Jean had an injection on his hip earlier on in the week but he was feeling it during the game and ended up having to come off. Johnny picked up his problem in the first half and he was still in pain at the start of the second half so we had to bring him off. We will know more in the next couple of days about how serious the injuries are."