Julian Brandt trained with Kai Havertz at Bayer Leverkusen on Thursday.
Leeds United have submitted a formal bid for the free agent.
Negotiations with Leverkusen over Brandt’s contract remain in progress.
Leeds are understood to be leading the race to sign him before his contract expires.
This comes as multiple reports confirm the English club’s active pursuit of the German midfielder.
Both clubs are said to be evaluating their options carefully.
Brandt’s versatility and speed have attracted interest from several European teams.
Leeds’ manager praised the German's imagination and work rate.
If the deal goes through, Brandt could join the English side before the summer window closes.
Fans are already speculating about his likely role in the midfield.
The transfer could also release funds for Leeds to reinforce other areas.