Stephen Ireland and Patrick Vieira will both be missing from City's midfield for the difficult Barclays Premier League trip to Everton tomorrow.
But playmaker Ireland, who has been ruled out for two weeks by a hamstring injury, will not be considered although he has a chance of playing in Tuesday's Carling Cup derby semi-final.
New signing Vieira, who arrived from Mancini's old club Inter Milan last week nursing a damaged calf, is now pencilled in for a possible debut at Scunthorpe in the FA Cup fourth round.
On the plus side, England Under-21 star Nedum Onuoha is back in full training and jostling for a place on the bench at Everton, with left-back Wayne Bridge on the verge of a return to training.
Mancini, who declared himself a Robinho fan on becoming manager last month, said it was "possible" that the mercurial Brazilian would play at Everton and in the semi-final first leg.