Glen Johnson made a £10m move from Portsmouth to Liverpool in 2009, but has recently failed to reach an agreement regarding a contract extension with the club meaning an exit in the coming months may be on the cards.
Johnson has often found himself at the centre of heavy criticism at Liverpool, and could be surplus to requirements as Brendan Rodgers prepares to ready his side for the step up into Champions League competition.
Aside from the pursuit of Adam Lallana, Liverpool have focussed much of their attention this summer on improving their options in the full-back department.
Sevilla left-back Alberto Moreno had emerged as the Reds' main target, but after the two clubs failed to agree a fee the move is off and Liverpool are now reported to have switched their attention to Luis Suarez's Uruguayan team-mate, Maxi Pereira.
Although Liverpool appear desperate to bolster in particular their left-back position, this does not indicate that Glen Johnson's place in the first eleven at Anfield is safe.
Jon Flanagan played the majority of last season as a makeshift left-back when in fact the 21-year-old's natural position is on the right-hand side of the defence.
Flanagan was so impressive in his role last season that he is likely to become Rodgers' first choice right-back this campaign, leaving Johnson's future increasingly in doubt.
Johnson is a player Redknapp knows well having worked with the defender previously at Portsmouth. In 2007 the 67-year-old brought Johnson to Fratton Park from Chelsea in a £4m deal, and the England international was a staple part of the Pompey side that went on to win the FA Cup in the same season.
There is yet to be any official word from either side regarding a possible deal.
Any potential move will depend on Liverpool's success in the transfer market, but Johnson is likely to be open to a switch to West London, if not only for one final big pay day before the end of his career.