Kyle, who primarily plays as a right winger, progressed through his hometown club's youth ranks before making his first-team debut in June 2024 at the age of 17.
The Republic of Ireland Under-17 international completed a successful trial with the Magpies in the summer of 2024 before putting pen to paper on a deal with the club, following in the footsteps of Alex Murphy, who also joined Newcastle from Galway in June 2022.
Kyle enjoyed a bright spell with Newcastle's under-18s side in the second-half of the 2024/25 campaign, registering five goals and two assists in ten Under-18 Premier League North fixtures.
He recorded a goal and two assists on his first start for the Toon teenagers in a 4-2 away win against Wolverhampton Wanderers.
Speaking on his move to the Magpies, Fitzgerald told newcastleunited.com: "I'm very happy. I had a few conversations with different clubs but as soon as Newcastle came in, it was a no-brainer for me.
"I was on trial in the summer and I really liked the city, people and the atmosphere at St. James' Park. I want to play for fans who really enjoy hard work, goals and creative players."