Sam Magri is expected to complete his switch to Liverpool by the end of this week.
The Pompey Academy defender spent last week on trial with the Merseyside giants and played for Liverpool Academy in their 3-1 win over Everton on Friday night.
Magri impressed in the match as the Reds registered their first academy victory over their city rivals for two years.
The 17-year-old is now set to complete his switch to Anfield in the next few days.
Liverpool officials still need to meet with Pompey administrator Trevor Birch to agree a fee for Magri, who is regarded as one of the Blues’ hottest prospects.
Any potential deal has been held up by Liverpool’s Carling Cup success on Sunday.
But after catching the eye during his trial, Magri’s exit from Fratton Park now appears inevitable.
The boyhood Pompey fan, from Fratton, has yet to feature in a first-team squad but has played for England at a number of age groups.
Last summer, Magri skippered the national under-17 side to the quarter-finals of the Fifa Under-17 World Cup in Mexico, scoring in their last-eight loss to Germany.
His departure would not enable Pompey boss Michael Appleton to add another loanee to his threadbare squad, however, as Magri is not considered a first-team player by the Football League.