"At the moment, there is nothing. In the end, maybe, I don't know. In the summer, it could be possible," said Mancini about the Bosnian striker.
Despite 13 goals this term, Dzeko has failed to earn a regular starting place in Mancini's line-up.
Mancini revealed in November that Dzeko was frustrated with his "super-sub" tag following a number of goals after coming off the bench.
But the City manager does want the former Wolfsburg forward to stay at Etihad Stadium despite his concern he could leave.
"Dzeko is an important player for us. We want him to stay here," he said.