Last week, UEFA fined the West London club for irregularities in revenue reporting and exceeding spending limits.
This means any new expenditure will need to be offset by income from departing players. No bonuses from the Club World Cup or other payments can help the club in this matter.
Chelsea registration issue
Chelsea has yet to register new signings Liam Delap, Joao Pedro, and Jamie Bynoe-Gittens, according to reports from Sportal.
The Blues will be unable to add new players to their Champions League squad next season unless they achieve a positive net spend.
The club's management may need to sell players worth at least £60 million to register all of the aforementioned players and meet UEFA's "positive net spend" requirement.
Otherwise, the Blues' new additions won't be eligible to play. Chelsea won the Conference League last season and reached the semi-finals of the Club World Cup.