"In one of the photos, Mancini is seen to be pulling at Balotelli's orange bib. In another photo, Balotelli is being restrained.
"I'm led to believe the incident blew over very quickly. With that in mind, the photos do need to be put into some sort of context because super-fast frames can show the spat but don't necessarily provide a true reflection of any time period.
"However, it doesn't reflect well on the champions. It ensures Balotelli will create headlines yet again and Mancini will be quizzed about his relationship with the player at tomorrow's press conference."
The pictures appear to show Mancini shouting and gesticulating towards Balotelli, who has scored three goals in 21 appearances this season.
One photograph shows the pair face to face with Mancini pulling Balotelli's training bib. In another, the striker appears to be pulled away by a member of staff.
The 22-year-old Italian has been involved in a series of controversies since his £24m move from Inter Milan in August 2010.
Archive: Mario Balotelli's super goal for Italy at Euro 2012
In December, Balotelli was set to take City to a tribunal over a two-week fine for missing 12 games last season because of suspensions.
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