The invention relates to a capsule (1) for a flanged cork stopper, the capsule (1) having a body (2) comprising a top (3) and a cavity (4) inside which at least two anti-rotation splines (5) are arranged, and the capsule further comprising an axial retention chamber (6) disposed within said cavity (4), wherein retention chamber (6) is shaped to receive and axially retain a flange of a flanged cork stopper. The invention also relates to a capsulated stopper comprising a flanged stopper, the flange of which is attached to the capsule (1) of the invention. The invention further relates to the production process of said capsulated stopper.