Koeman is under huge pressure after last week's home defeat to Champions League opponents Bayern Munich.
Barca president Joan Laporta has been encouraged by members of the board to sack Koeman, though he has so far refused to pull the trigger.
However, speaking on El Chiringuito, pundit José Alvarez reports Laporta could take "drastic action" if Barca flop against Granada tonight.
If Barca produce an "underwhelming" performance, Laporta is prepared to dismiss Koeman.
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