The midfield player from Albion is expected to pay £8 million plus add-ons to join the Bundesliga team. As Albion neared the end of their week in Tokyo, talks between the two clubs continued.
As Fabian Huerzeler and his German coaching staff acclimate to life in the Premier League, Albion were eager for him to stay.
However, the team has added Mats Wieffer to the midfield, and they have always accepted that Gross may wish to return to Germany at some point for both personal and professional reasons.
