The former Celtic man is not featuring regularly for The Addicks.
Leeds United's pursuit of loan signings ahead of today's emergency loan deadline has been well publicised.
A deal for Sunderland man Liam Bridcutt has been long protracted, although now looks to have been revitalised at the last minute. Meanwhile Kyle Lafferty and Lewis Grabban of Norwich City were also targeted to no avail whilst the likes of Anders Lindegaard were also mentioned.
Now it seems they had made a move for former Celtic striker Tony Watt.
Watt, who once scored v Barcelona whilst at Celtic, has previously spent time at Belgian clubs Lierse and Standard Liege before heading to Charlton in January this year.
He went on to score five goals for Charlton last season before beginning this campaign with a bang - scoring three in the opening three fixtures.
But he has not scored since then and has not featured for The Addicks since a defeat to MK Dons at the start of this month.
Now Watt is with Cardiff City where he will be hopeful to get back to his best goalscoring form and leave Leeds jealous over missing out on the player.