City manager Roberto Mancini has publicly aired his frustrations at the former Arsenal star, who left the Emirates Stadium for the North West outfit in 2011.
Following a poor spell, Nasri managed to push City into the final of the FA Cup with a goal in their 2-1 victory over Chelsea at Wembley yesterday.
"Now I am playing really well, really great," Sky Sports News quotes Nasri as saying. "I am full of confidence. I wish I was like this since the start of the season but I had a couple of injuries which stopped me.
"I try to do my best for the team and we are going to fight until the end for the league and we want to win the FA Cup. It is the right moment."
While City could end their season with silverware, they are expected to hand over the Premier League title to fierce rivals Manchester United due to their 15-point gap from the top.