Born in England to Italian parents, Infantino trains at the Lee Valley Athletics Center in London, where he grew up sporting.[2] For competition purposes, he transferred his country of allegiance from Great Britain to Italy in June 2016.[3] Infantino participated in one edition of the European Athletics Championships in 2016, one of the World Athletics Championships in Doha 2019 and one World Athletics Relays Championships in 2021. In 2021 he made his first Olympic Games, qualifying for both the 200m and 4 × 100 m relay.
Doping violation
In April 2022 Infantino was issued with a three-year ban backdated to December 2021 for an anti-doping violation in relation to presence and use of a banned substance.[4][5][6] The nature of the substance or details of the judgement were not publicly disclosed by the Italian Anti-Doping Organization. His results from June 2021 onwards were disqualified.