Celtic boss Brendan Rodgers is already looking towards the January transfer window.
Aston Villa are unbeaten in their last three games in the Championship.
Chelsea crushed Manchester United 4-0 at the weekend.
Sunderland went down to another defeat, this time against West Ham United at the weekend.
Liverpool have kept just one clean sheet in the Premier League so far this season.
West Bromwich Albion are said to be keen on the former Blackburn Rovers player.
The summer signing has endured a difficult start to life with Leeds.
West Ham United beat Sunderland 1-0 on Saturday afternoon.
The Tottenham Hotspur striker has been out since September.
Celtic edged out Mark Warburton's Ibrox side Glasgow Rangers 1-0 on Sunday.