In January, Levski's top players agreed a pay cut to ease the club's cash flow problems while some first team regulars were sold during the transfer window.
Levski, already out of the domestic cup, are fourth in the league, nine points behind leaders Litex Lovech and in danger of missing out on a European place for the first time since 1990.
However, the fans have given their backing to coach Georgi Ivanov, whose offer to resign after the 3-0 weekend defeat at Litex was rejected by the club.
"Levski are not a club who can exist attempting to eke out a livelihood," the supporters added, saying the club was in need of fresh money, new investors and a long-term strategy.
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