Lavia, who arrived from Southampton in the summer on a big money deal, sustained a thigh injury in December.
He had already spent half the season on the treatment table, but will now be back for pre-season.
Per The Standard, the club have not given out more information about the nature of the setback.
They have merely stated that the summer arrival from Southampton "will not feature again this season."
Christopher Nkunku, Reece James, Levi Colwill, Wesley Fofana and Lesley Ugochukwu are also out at present.