Chelsea have recorded a 96.6 million pound ($A182 million) financial year loss.
However after two profitable years, the English Premier League heavyweights say they remain compliant with UEFA's Financial Fair Play regulations.
The club cites a lack of Champions League football, costs associated with changing manager and a record outlay on players Kepa Arrizabalaga, Christian Pulisic, Mateo Kovacic and Jorginho for the loss.
Turnover grew slightly to 446.7 million pounds.
"Consistent revenue growth and careful financial management over recent seasons has allowed the club to make significant levels of investment in the playing staff whilst maintaining compliance with UEFA Financial Fair Play regulations," chairman Bruce Buck said on Tuesday.
"This has contributed to another Europa League victory at the end of the 2018-19 season and a return to the highest level of European competition."
Buck said the solid commercial foundation, allied to a young and exciting team led by Frank Lampard, means the Blues are well placed to sustain their pursuit of success.
Chelsea made a 62 million pound profit last financial year.
The London club are fourth in the Premier League, 20 points behind leader Liverpool, and play at Brighton on Tuesday.
Australian Associated Press