The Portuguese government's latest bond auction has been successful, but the yield it has had to offer investors has risen sharply.
The sale of 500m euros ($651m; £418m) worth of one-year bonds was two and a half times oversubscribed.
The yield rose to 5.3%, which BBC business editor Robert Peston said was "hugely expensive" for one-year bonds.
The Portuguese government is struggling with large debt levels, but denies it will need a European Union bail-out.
Bonds are effectively loans, in this case made by investors to governments. BBC News
