The 19 - year - old Serbia Under 21 international has signed a four - year contract .
The 19 - year - old Serbia Under 21 international will return to selling club Red Star Belgrade for the remainder of the season before joining up with Liverpool in July .
The 19 - year - old Serbia Under 21 international has signed a four - year contract , but will return to selling club Red Star Belgrade for the remainder of the season before joining up with Liverpool in July .