Pignatiello began his career at youth level with Rangers and later played for St Mirren before joining Livingston.
[4] He made his professional debut as a late substitute in a Scottish Premiership 3–2 defeat against Celtic in September 2020.
[10] He made his first appearance for the club in a pre-season friendly draw against Annan Athletic at Raydale Park.
[11] Pignatiello left Morton by mutual consent at the end of the 2022–23 season, with the club saying he wished to pursue an opportunity outside of football.
[15] He scored the club's first goal back in League One, a volleyed equaliser in a 1-1 draw with Inverness Caledonian Thistle.