De Barr made his debut for Europa on 12 August 2018, in the 2018 Pepe Reyes Cup game against former club Lincoln Red Imps.

[15] On 21 March 2019, it was revealed that De Barr signed for the 2019–20 season with Spanish club Real Oviedo,[16] being initially assigned to their B-side.

[21] However, continued uncertainty over the return to football in Spain led to De Barr re-joining Lincoln Red Imps on 1 September 2020.

[22] Upon his return, he was utilised primarily as a winger with Kike Gómez the lone striker, but his performances attracted the attention of Wycombe Wanderers who invited him for a trial in July 2021.

[28] On 29 December 2022 he came on as a second half substitute, in place of Ali Al-Hamadi, for his fifth appearance of the season for Wycombe away to Plymouth Argyle at Home Park, but immediately following the full time whistle he collapsed to the ground and, following medical attention on the pitch, was taken to hospital where he was later released.

[33] De Barr subsequently became a regular in the side during their UEFA Nations League campaign, scoring his first international goal on 16 November to break the deadlock against Armenia making him the youngest scorer in the tournament's history at 18 years & 248 days until September 2024,[34] when James Scanlon broke the record.