The Wanderers left-back has struggled to make any kind of impact at the Reebok Stadium this term and has not managed a single appearance for the Premier League club.
Samuel`s move not only provides him with the opportunity of first-team football but also boosts Cardiff`s promotion ambitions over the remaining eight games of the season.
The 29-year-old former Aston Villa man arrives just days after the Bluebirds lost influential centre-back Mark Hudson for between four to six weeks due to a Grade Two tear of his knee ligaments, with manager Dave Jones preparing for a possible defensive reshuffle.
Samuel, who has made 83 appearances for Bolton since signing in 2007, is in line to make his City debut when the club return to action following the international break at home to Derby on April 2.
Source: PA
Source: PA