In 2004, Parral was appointed as a youth manager of Gibraltarian side Lion Gibraltar. He managed the club from under-6 to under-eighteen level. In 2012, he was appointed manager of the Gibraltar women's national football team. He also worked as manager of the Gibraltar women's national under-21 football team. In 2015, he was appointed as an assistant manager of the Gibraltar national football team. He also worked as goalkeeper coach of the Gibraltar national football team.[1]
In 2022, he returned to Gibraltarian side Lion Gibraltar as manager. He was regarded to have revived the club at the end of the 2021/22 season and make their style of play less defensive.[2] In 2024, he was appointed manager of English side Billericay Town. He became the first Gibraltarian football manager to manage a senior team outside of Gibraltar. He was described as "aim[ing]... to build up the club to challenge for a Championship place over the next 3 years" while managing the club.[3]