The midfielder could be set for a sensational return to his old club after their promotion to the Premier League.
Lallana was a reliable player for the Albion this past season, playing under Roberto De Zerbi.
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He was at Wembley Stadium in London to watch the Saints beat Leeds United in the playoff final on Sunday.
Per The Telegraph, he is set to come back to the club if they can hash out a contract.
He would be head coach Russell Martin's first Premier League signing ahead of next season.