Isak struggled with injuries and poor form after making an acrimonious £125 million ($168 million) move from Newcastle 12 months ago.
The 26-year-old Swede netted just four times in all competitions last season, but already has three goals in four games this term.
Reds boss Iraola is impressed with Isak's adaptation to his tactics since the Spaniard arrived from Bournemouth to replace the sacked Arne Slot in the close season.
"I think he's doing…