Paul Smyth could join Charlton on loan from QPR.
The Northern Ireland international, 23, spent last season on loan at Wycombe.
And he will be allowed to move elsewhere following Rangers’ recent signings of Albert Adomah, Chris Willock and Macauley Bonne.
QPR are also looking to complete the signing of forward Charlie Kelman, 18, from Southend United.
Charlton, who recently sold Bonne to QPR, have been interested in Smyth for some time.
A loan move there was agreed in January last year but fell through and Smyth ended up being loaned to Accrington Stanley.
The Addicks remain keen on Smyth and are looking to snap him up now Rangers are ready to let him go again.
Conor Masterson could also move on loan ahead of this week’s deadline.
Plans to loan the centre-back out last January were scrapped after he broke into the first team and impressed.
However, QPR manager Mark Warburton has since been concerned that the youngster's encouraging run of games might result in Masterson - who had not made a senior appearance prior to his arrival from Liverpool last year - missing out on vital first-team experience by remaining on the fringes of the Rangers side rather than going out on loan.
The Irishman is therefore being lined up for a loan move and will certainly be allowed to go if QPR bring in another centre-back - several possible signings in that position are being considered.