The Newcastle United defender ruptured his anterior cruciate ligament in pre-season.
Lejuene has been working in Italy since undergoing an operation in Rome early last month.
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The 27-year-old – who has been posting updates on Instagram – could be back early next year.
Asked for an update on Lejeune's return, United manager Rafa Benitez said "He is getting better – you have his Instagram!
"He will come back maybe in one week He's doing his rehab in Rome, special facilities."