Isak is recovering from a serious leg fracture just before Christmas.
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Potter isn't giving up on having Isak available, along with Tottenham duo Lucas Bergvall and Dejan Kulusevski, for the playoff against Ukraine.
"Right now we're just keeping our fingers crossed and hopefully we can get some of those guys back," he told Aftonbladet.
"But if not, we have to find a solution with the guys that are available."
Potter's suggested timescale would mean Isak playing again for Liverpool well before the end of this season.