The controversial Italian was subject to one of the more prolonged transfer sagas of the January window and eventually left on the last day of the month, moving to AC Milan for a fee believed to be around the £20 million mark.
The 22-year-old had endured a tough first half of the season with the Premier League title-holders, scoring only three goals in 20 appearances, and Johnson feels that all of City's other three front-line strikers will produce on a more regular basis.
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"I'm not being disrespectful to the guy, everyone in the country knows what he's like. On his day, he can be a great player but City have got other great players who do it a lot more often and score more goals than him."
Balotelli's discipline issues were well documented during his time in England - he picked up 11 yellow cards last season - and Johnson also suggested that the forward has a propensity towards petulance.
"Mario winds himself up, you don't need to do too much as an opposition defender," he continued.
"We all have our faults but Mario let his side down with silly red cards and stuff like that. He's a great player but we didn't see that enough."