The fee is set to be around €20m, which will be a club-record transfer for the newly-promoted side.
Liverpool have a 10% sell-on clause in the deal when they sold Awoniyi to Union Berlin. Therefore, they will receive €2m from this sale.
Awoniyi really found his footing in the Bundesliga, scoring 15 goals in 31 appearances. Liverpool sold him for around €7.5 to Berlin last summer.