The Bosnian striker, starting only his 15th Premier League match of the season, swept home the only goal 10 minutes before half-time to earn City a priceless victory that assures them of a top-three finish and qualification to the group stage of next season's Champions League.
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"Yes, could be. I am happy because he scored an important goal," he told the Manchester Evening News.
"With his goal we are in the Champions League and probably in second position. We have four days to recover from this game, so could be."
Despite scoring 14 times this term, the City boss lamented Dzeko's goal return but believes he can improve next season if he remains at the Etihad Stadium.
"In the end he has scored important goals this season," Mancini added. "I think he can do better. For me he is a top striker but he could score more goals.
"It is clear he didn't play all the games. I think he is one of the best in Europe for me but he can do better than this year."