Manchester City striker Mario Balotelli has suffered a knee injury while training with Italy, the Italian Football Federation have confirmed.
The 20-year-old reported a recurrence of a problem with his right knee minutes into a training game against the Italy Under-18s side.
The former Inter Milan forward will be assessed by Italy's medical team ahead of Friday's Euro 2012 qualifier against Estonia in Modena and a friendly with the Republic of Ireland in Liege the following Tuesday.
Balotelli endured a frustrating time with injuries in his first season in the Barclays Premier League.
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