The Spanish 23-year-old moved to the Andalusian side earlier this month for 1 million euros ($1.1 million) with just six months left on his Barcelona contract.
"He will be out for a long time, which shrinks the squad further still," Machin told reporters. "It's a muscle injury which is probably a month. It seems that disappointments don't just come one at a time, Joris (Gnagnon, defender) left training with an injury too."
Munir's problem will likely keep him out of Wednesday's Copa del Rey first leg clash, the return next week and league matches against Levante, Celta Vigo and Eibar.
($1 = 0.8808 euros)
(Reporting by Rik Sharma; Editing by Christian Radnedge)
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