Newcastle sell Abeid to Panathinaikos
The midfielder has moved to the Athens-based Greek Superleague side after joining Newcastle from Ligue 1 side Lens in 2011.
The Algeria international endured a frustrating spell at Newcastle, managing just 21 appearances during his four-year stay on Tyneside.
Abeid made a temporary loan move to St Johnstone at the beginning of 2013, which was followed by a season-long loan at Panthinaikos later in the year.
The 23-year-old made his Premier League debut for Newcastle in the 1-0 home win over Liverpool last November.