I could think of two situations here:Don´t celebrate before you score
, it was what the fans did here!Ref. Youtube
In another context, what about "Don't celebrate before the final whistle
In yet another context, and to the ones not versed into soccer/football or sports terminology, there´s also the following one:Don't count your chickens before they hatch.Cf. Como dizer "Não conte ovo dentro da galinha" em inglês
Aah! And it´s not over until the fat lady sing
s! (proverb-wise and if you aren´t overly conscious about being politically correct). It ain't over till the fat lady sings (informal way.)
Plus, "It ain't over till it's over.
" (Iogi Berra, the Baseball legend stated - referring to the baseball's 1973 National League pennant race. His team was an underdog and it did won at the end of the championship.)