The Spanish playmaker scored twice in his first game since injuring his groin against Leicester City in January, before being withdrawn at half-time.
Winger Ian Poveda also made his return from injury, coming on in the interval.
Leeds won the game 2-0.
Holding midfielder Kalvin Phillips did not play any part, making the England international unlikely to return from a calf injury for Monday's game against one of this season's surprise packages.
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