[3] He played seven games for the Rangers' American Hockey League (AHL) affiliate, the Hartford Wolf Pack, at the end of the 2023–24 season, collecting three assists.
[9] Mancini was demoted to Hartford along with several other waiver-exempt players two days before the start of the regular season in a move to save salary cap space, but was recalled to the Rangers prior to their opening game.
[11][12] He made his NHL debut in the Rangers' opening night game against the Pittsburgh Penguins on October 9, 2024.
[2] According to hockey scout Jess Rubenstein, Mancini is "the prototype stay-at-home defenseman, with excellent on-ice vision.
[citation needed]Early in the 2024–25 season Rangers' head coach Peter Laviolette said of why he was keeping Mancini on the team, despite Lindgren's return: A little bit of everything to be honest, it’s his skating, it’s his size, it’s his poise with the puck.
[17]Mancini's father Bob Mancini served as the head coach of several college ice hockey teams, including Ferris State University and Michigan Tech, and also helped found USA Hockey's National Team Development Program, and served as a scout for the Edmonton Oilers.