Ndong was one of several signings on transfer deadline day at the Stadium of Light.
The club captain has left for personal reasons.
The former Villa midfielder has praised chairman Tony Xia.
Pundit blasts Tottenham signing Sissoko referencing his performances for Newcastle last season.
Sakho looked set to leave Liverpool on loan, but after turning down offers he could face an uphill battle to get himself back into the side this season.
The Spaniard has been out of action for nine months.
Moussa Sissoko left Newcastle United in the final minutes of the transfer window but signed for Tottenham Hotspur rather than Everton in dramatic circumstances.
Yannick Bolasie's departure to Everton may have the Eagles flapping but with Benteke, Mandanda, Townsend and Tomkins, Palace have a much stronger squad.
Leeds United have agreed a new deal with the teenage midfielder.
Fans at Wolves certainly feel they got the better deal.