Rudy Hermann Guede, a native of Ivory Coast, is wanted in connection with the sexual assault and fatal stabbing of 21-year-old Meredith, found dead in her Perugia apartment last month.

Guede was arrested in Germany after police caught him riding on a tram without a ticket.

Two other suspects, Meredith's American flatmate Amanda Marie Knox and Knox's then-boyfriend, Italian Raffaele Sollecito, remain jailed in Italy in connection with the case.

Prosecutors in the south-western German city of Koblenz agreed on Monday to turn Guede over to Italy.

"The extradition can take place as soon as Italian authorities agree to a date for the handover," they said.

Italian authorities say DNA tests confirm Guede had sex with Meredith on the night of her murder.