The 25-year-old has been signed to provide cover for Gabriel Gudmonssson.
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Bard is a versatile player who can also play at left wing back.
Leeds boss Daniel Farke has been keen to add a full-back during the summer window, and looks to finally have his man.
The French defender, formerly of Lyon, made 31 appearances in Ligue 1 last season, scoring two goals and providing one assist as Nice finished 16th.