Petrov scored against West Ham United in the Premier League last week and set up Carlos Tevez's goal but he was an unused substitute in City's 1-1 draw at Aston Villa on Monday.
"I wanted to save my energy to win some jitball matches during Bulgaria training sessions," Petrov said sarcastically to explain why he did not play against Villa.
Petrov, who joined City from Atletico Madrid in 2007, ran to the bench to celebrate his goal by pointing to his shirt and number.
"No, I didn't do it for him (Hughes). I did it for my wife because she forgot my number", Petrov told reporters on Wednesday at the Vasil Levski national stadium, hinting at his limited opportunities at City.
Petrov is preparing for the Balkan country's last two World Cup qualifiers against Cyprus and Georgia on October. 10 and 14.
He started last season well but has not been a regular for City since suffering a serious knee injury last October.
Petrov, 30, was poised to join Tottenham Hotspur on the final day of the transfer window but the move broke down.
"When they give me a chance I give my best," he added. "I think I've shown that I deserve a place in the starting line-up but it's up to him (Hughes).
"It's not a pleasant (situation). I'm a professional and I'm observing my obligations but it doesn't rest well with me."
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