The 28-year-old – today is his birthday – has been training with Rangers and scored in the recent pre-season friendly against Manchester United.
Browsing: Mark Warburton
The 22-year-old attracted interest from clubs in the summer after an impressive campaign last season and he is now on Celtic’s radar.
The centre-back, who endured a miserable one-year spell in Scotland, thanked the Ibrox club in a message to the 10 sides he represented during his career.
Caixinha’s reign at the Glasgow club was filled with poor results including the club’s worst ever European result as they were beaten by Progres Niederkorn over two legs.