Since making his loan move from Liverpool permanent last summer, the 24-year-old has scored 16 goals in 35 games for the German club.
During his time at Liverpool, Awoniyi went on seven separate loan spells, including two with Belgian side Mouscron and spells with German clubs Frankfurt and Mainz.
He joined Union Berlin in the summer of 2020, and a year later, for £6.5 million ($9 million), he made the move permanent.
Since his move to Berlin, the striker has blossomed and is now a full Nigeria international, which would improve his prospects of obtaining a work permit to return to the Premier League.
That has attracted the interest of English top-flight sides, with the Hammers, Magpies and Saints leading the way.
