City's £32.5million signing was given the chance to impress as a ninth-minute replacement for the injured Roque Santa Cruz at Everton on Saturday, but the Brazilian was taken off on the hour after a negligible contribution to his side's 2-0 defeat.
Mancini did little to back his player, saying: 'Does he have a future here? All players try to work hard during the week in training and that is the most important thing. If he wants a future here, then, yes, that is what he has to do.
Walk of shame: Robinho is substituted against Everton by Roberto Mancini
'I thought Robinho could have been a big player for us here, but sometimes a player is on form and sometimes he is off.
'I wanted to change the situation in the second half and if that means taking him off, then I will. I cannot worry about him, only about the result.'
City are likely to sell their Brazilian misfit for a sizeable fee in the summer.
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