Veliz made his debut for the club during a 0-0 draw against Valencia in La Liga on Saturday.
The 20-year-old came off the bench in the 86th minute and nearly scored for his loan team.
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Veliz will be hoping that he can push on in the coming games, with manager Quique Sanchez Flores stating pre-game: "Alejo Veliz has trained in an extraordinary way this week.
He is tremendously hungry and does everything we ask of him.
He will surely be ready for (the game). He's a boy who is going to mark a clear path of what the team needs again."