Charlton's failure to earn promotion to the Championship has forced the club to formally place a number of staff at risk of redundancy. A period of formal consultation will now take place to try and work out alternative ways to hit the required budgets.
The staff in question have not officially been made redundant, but managing director Stephen Kavanagh admits it will be a testing time for the club, who were beaten in last season's League One play-offs by Swindon.
Kavanagh told the club's official website: "As a consequence of the team not regaining Championship status, we have to put in place plans for life in League One next season.
"This has necessitated more cuts in operating costs across the whole club, with every line of every department's budget being scrutinised, and these affect both football and non-football staff."
He added: "This is going to be a difficult period for everyone at the club, but it is essential that we all work together to find the best outcome from a very demanding period."