Spaniard Alonso has extended his contract until June 2021. He began his career with Real Madrid before moving to English club Bolton Wanderers and then Fiorentina.
Second-placed Fiorentina host Lazio, who are 10th, in Serie A on Saturday.
(Reporting by Agnieszka Slupska and Silvia Recchimuzzi in Gdynia; Editing by Tony Jimenez)
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