The 23-year-old attacking midfielder, who has been capped by the Republic of Ireland at youth level, arrives having featured 10 times for Boro this term and netted a last-minute winner on New Year’s Day as Middlesbrough beat Hull City at the MKM Stadium.
View the best images from Gilbert's first day as an Addick below...
Gilbert could make his Charlton debut on Saturday when Stevenage visit The Valley. Click here to purchase your tickets now!
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