The Sweden attacker underwent knee surgery in May and has been out since.
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The 25 year-old is expected to be back in action at the end of November.
Kulusevski told Viaplay: "The status is great.
"I wake up every day with the same hunger. I will be back very soon, if everything goes according to plan I will be back in 2-3 months."
His contract with the London club extends until the summer of 2028.
