Aston Villa boss Paul Lambert says striker Darren Bent is not for sale ahead of the close of the transfer window.
It is understood Saphir Taider is set to leave Southampton just three weeks after arriving on a season-long loan.
The 24-year-old was one of four players listed by the London Road outfit earlier this month for a breach of discipline.
Gabriel Zakuani was taken off the list by the Posh, but Nathaniel Mendez-Laing, Tyrone Barnett and now Sinclair have all moved on after being told they could go.
Sky Sports revealed last week that Barnsley failed with a bid for both Barnett and Sinclair, but now they have returned to finalise his capture.