What happened: The agreement is expected to be completed after Thursday's European playoff second leg. The midfielder played all 90 minutes of last week's 2-2 first-leg draw.
Why it matters: The move would place him alongside Max Arfsten in a four-American contingent. It would also take the 22-year-old to England's second tier after six years in Croatia.
By the numbers: The reported fee is about €5 million. He played 90 minutes in a first leg that finished 2-2.
What to watch: Thursday's second leg comes before the expected completion of the transfer.