Hearts have released 21-year-old Portuguese full-back Tiago Costa from his contract at Tynecastle.
Tiago Costa signed for Hearts on 4 August
The Edinburgh club signed him up on a two-year deal after he had been released by Benfica in the summer.
But Tiago Costa played just one game for Hearts - a 4-1 home victory over Inverness on 26 August.
A spokesman for the Scottish Cup holders said: "Tiago has requested a return to Portugal for personal reasons and we were happy to oblige."