Barnsley defender Toby Sibbick has been loaned to Belgian Pro League side KV Oostende for the entire 2020-21 season.
The 21-year-old, who can also play in midfield, joined the Tykes from AFC Wimbledon last summer.
He made 18 appearances before being loaned to Hearts in January - but had only played two games when coronavirus ended the Scottish season in March.
Oostende are due to start the new Pro League campaign against Beerschot Wilrijk on 10 August.
Find all the latest football transfers on our dedicated page.