The Raiders elevated Omameh to the 53-man roster from their practice squad Wednesday.
Omameh was released by the Saints on Saturday, Amie Just of Nola.com reports.
The Saints re-signed Omameh on Thursday, Nick Underhill of NewOrleans.Football reports.
Omameh signed a contract with the Saints on Sunday, Field Yates of ESPN reports.
Omameh is inactive Sunday against the Falcons due to a knee injury, Paul Schwartz of the New York Post reports.
Omameh (quadriceps) is inactive for Sunday's game against the Colts, John Oehser of the Jaguars' official site reports.
Omameh (quadriceps) is listed as questionable for Sunday's game against the Colts, Mike Kaye of FirstCoastNews.com reports.
Omameh (quad) was downgraded to out for Sunday's matchup with the Browns.
Omameh is listed as questionable for Sunday's game against the Browns with a quadriceps injury.
Omameh (knee) is active for Sunday's game against the Chargers, John Oehser of the Jaguars' official site reports.