Leeds United have been linked with a move for former England centre-back Caulker.
The 26-year-old has rediscovered his fitness and form at Scottish Premiership side Dundee, where he has made 16 appearances since joining in February.
And according to MirrorFootball , Leeds are considering a £1.5million bid for the defender, who was capped by England in 2012.
Steven Gerrard's Rangers are also being linked with a move for the former QPR star before Thursday's transfer deadline.
Dundee are said to be keen on turning a profit on Caulker after they moved for him on a free transfer when he was released by QPR six months ago.