Stoichkov was installed as the new Celta boss just over a month ago as the replacement for Fernando Vazquez but Celta have since lost four successive matches and slumped into the bottom two.
It is a worrying situation for the Galician club, but Mourino has given former Bulgaria national team coach Stoichkov his backing, and he said: "Stoichkov will continue with us in the Primera Liga or the Segunda Division next season."
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