Portsmouth have completed the signing of midfielder Johnny Ertl on a one-month deal.
The 29-year-old Austria international impressed manager Michael Appleton in a friendly against Swindon earlier this week.
Ertl began his career at Sturm Graz and came to English football in 2008 when signed by Crystal Palace.
He featured most recently for Sheffield United before he was released in May.
- Michael Appleton
- Sturm Graz