Charlton Athletic have certainly shown some good signs of improvement in their performances since Johnnie Jackson took over at the helm. 

The Addicks' legend has since been given the job on a full time basis and is clearly intent on helping his side to climb the table as we move further into the new year.

With the transfer window having now opened, Charlton have a good chance to add to what is an already talented existing squad as they seek to further improve their fortunes on the field of play.

As with most clubs up and down the country, both arrivals and departures appear likely at the Valley this month.

Here, we take a look at the January transfer business that could happen this month at Charlton Athletic.

In: Kieran Sadlier

Soccer Football - Pre Season Friendly - Rotherham United v Newcastle United - AESSEAL New York Stadium, Rotherham, Britain - July 27, 2021 Rotherham United manager Paul Warne with Kieran Sadlier before the match Action Images via Reuters/Ed Sykes

As per a recent exclusive by Football League World, Charlton are said to be interested in signing Rotherham United winger Kieran Sadlier.

Also a target for the likes of Portsmouth and Bolton Wanderers, the 27-year-old is set to see his contract at the ASSEAL New York Stadium expire come the end of the current campaign,

This means that the Millers could well look to cash in during the January transfer window in order to avoid losing him for nothing next summer.

Sadlier was previously the subject of a bid from an unnamed League One side earlier this season.

In: Elliot Lee 

Lee has been in fine form for the Addicks this term but could well be recalled by his parent club, Luton Town, this month.

His contract at Kenilworth Road is side to expire next summer, which means the Hatters could look to cash in if there is enough interest this January.

Charlton would surely be keen on making the move for the 27-year-old permanently, as he has greatly settled under Jackson.

Surely the Addicks would be at the front of the queue if there was a chance to sign the midfielder this month.

Out: Harry Arter

Although it is seemingly unlikely that he will be recalled by Nottingham Forest this month, there is still a great deal of uncertainty over the future of Arter at the Valley.

Returning to the club over the summer, the midfielder has struggled for fitness and form and as a result has played just five games this season.

Therefore it could be the case that Arter return to Forest in order pursue a move elsewhere so that he can get the game time that he needs.

So far this move hasn't worked out at all for the 32-year-old.