Issahaku opened the scoring in the 36th minute with a left-footed shot after scoring from the right.
The former Steadfast FC winger doubled Sporting’s lead in the second half with a fine shot after setting up a light marker.
The highly-rated teenager completed his hat-trick in the 79th minute, with goals from Ribeiro and Fernandes, as Sporting recorded a thrilling home win.
Issahaku’s performances for Sporting’s youth team may have helped his development since joining the Portuguese giants.
He has enjoyed limited playing time for Sporting’s senior team this season, often coming on as a substitute in the second half.
The teenager made his UEFA Champions League debut in October when Sporting Lisbon lost to Olympique Marseille.
He has since made a cameo appearance for the Portuguese side and has played 10 matches in all competitions for the club so far.
His latest performance, however, could increase his chances of getting more playing time for Sporting’s senior team.