The midfielder found the back of the net with an acrobatic finish as the underwhelming hosts eked out a tight win over Lucas Alcaraz’s bottom-of-the-table side on Saturday.
Barcelona climbed up to second place in La Liga with a forgettable 1-0 win over bottom side Granada.
Real Madrid put pressure back on to the champions earlier on Saturday as Cristiano Ronaldo hit a hat-trick in a 4-1 win at Alaves.
Luis Enrique’s men were hardly emphatic in response as Lionel Messi, Neymar and Luis Suarez drew a rare collective blank.
It was left to Rafinha to continue his quietly impressive goalscoring form in the Spanish top flight this season – the Brazilian midfielder’s acrobatic volley early in the second half his fifth in six league games.
Granada remain winless, with three points from 10 matches, and showed limited ambition throughout, but coach Lucas Alcaraz will at least take solace that a repeat of the 7-1 thumping at Atletico Madrid earlier this month was avoided and never appeared to be on the cards.
Luis Enrique continues to grapple with a lengthy injury list and made three changes from last weekend’s dramatic 3-2 win at Valencia, with Denis Suarez in for injured captain Andres Iniesta and Sergio Busquets rested on the bench ahead of Tuesday’s Champions League trip to Manchester City.