 Murphy subsequently joined the Limerick under-21 hurling team in 2016 and played during the team's unsuccessful championship campaign.In his second season with the team he won a Munster Championship medal after coming on as a substitute for Tom Morrissey in Limerick's 0-16 to 1-11 defeat of Cork in the final.On 9 September 2017, Murphy was named at centre-forward for Limerick's 0-17 to 0-11 defeat of Kilkenny in the All-Ireland final.