[9] On 25 April 2017, it was announced that Scannell had been nominated by his teammates for the 2017 Munster Rugby Senior Player of the Year, alongside John Ryan and Tyler Bleyendaal.

[18] Scannell signed a two-year contract extension with the province in January 2023,[19] and came on as a replacement in Munster's 19–14 win against the Stormers in the final of the 2022–23 United Rugby Championship on 27 May 2023.

[24] On 11 February 2017, Scannell made his debut for Ireland when, due to captain Rory Best's illness, he started against Italy in the Six Nations.

[26] On 10 June 2017, in the one-off test against the United States, Scannell scored his first try for Ireland, doing so in the 55–19 win in the Red Bull Arena, New Jersey.

[30][31] Scannell was selected in the 31-man Ireland squad for the 2019 Rugby World Cup,[32] having featured in the warm-up matches against Italy[33] and Wales.