Italian publication Irpinia News suggests that the Reds have come to an agreement with the Belgian club for the 19-year-old midfielder.
Bastien spent last season on loan with Italian Serie B side Avellino and is reportedly seen as one for the future by Jurgen Klopp and the Liverpool hierarchy, who could send him out for more first-team experience next term.
It is understood that Bastien would cost Liverpool up to £4.6million.
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