Monaco have announced the signing of Chile international defender Guillermo Maripan on a five-year deal from Alaves.
The fee is said to be €18 million (£16m/$20m).
Monaco have endured a difficult start to the season in Ligue 1 after being in relegation difficulty throughout 2018-19.
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They have gone down to consecutive 3-0 defeats to start this campaign, and have seen a player dismissed in each game.
The club welcomed the signing of the 23-cap international, who moved to Spain from his native Chile in 2016.