The Montenegro star told Italian newspaper Tuttosport: "I arrived at City behind in my physical condition and so I have always been behind the shape of others.
"Then I went to the national team and I got injured again, thus losing more time."
Jovetic captained Montenegro against England on Friday and he feels that showed he is getting back to his best, physically.
"Against England, I proved to be in good shape and now I just need to play regularly to find the best condition, I'm not worried," he said.
"If I would have not gone to Manchester City, I would have gone to Juventus," he added.
"This summer, the situation was simple: I had a price of €30 (£25.4) million, but I never said that I wanted to go to Juve.
"I only asked to leave Fiorentina and I was pleased. The interest of Juventus? I was aware of the deal, I read about it on the newspapers and I know that they were speaking with my agent.
"In the end, however, I chose to go abroad and now I'm happy. I don't regret the choice I made."
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