The 21-year-old promising midfielder moved to Ethihad back in 2015 from Fulham, after which he spent two and a half years on loan in Celtic.
This summer, Roberts returned to the location of the City, but immediately was sent for rent.
According to the official website of Girona, the Spanish club signed a one-year contract with the Party.
During the time spent in Celtic, Roberts scored 12 goals and gave 13 assists in 65 games in all tournaments.
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