The 18-year-old has been rewarded for his impressive form, which included the decisive goal in last week's 2-1 Champions League win over Barcelona.
The club revealed the new deal would tie him to the club until summer 2016.
Celtic striker Tony Watt has signed a new four-year contract.
The 18-year-old has been rewarded for his impressive form, which included the decisive goal in last week's 2-1 Champions League win over Barcelona.
The club revealed the new deal would tie him to the club until summer 2016.
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