The move has been in the process since the window opened, with the clubs already having agreed a fee of £2 million.
However, the Spanish media reported that 'legal issues' were holding up the transfer at the start of the month, and Joselu returned to pre-season training with the rest of Newcastle's first-team squad last week.
He is expected to travel to Alaves' training complex in the next couple of days though, with his transfer set to be concluded provided he passes a medical without any problems.
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