Portugal has raised 750 million euros ($US1 billion) in its latest sale of government bonds.
Bond traders said demand for the four and 10-year bonds was the highest so far this year.
The average interest yield on the 10-year bonds was 6.2%, up from 5.3% last month.
The yield on the four-year bond rose to 4.7% from 3.6%.
The BBC reports bond issues by the Irish Republic, Spain and Greece were also heavily subscribed.
