On the right hand side of the apse is an identical entrance arrangement to that found at the end of the left hand aisle, involving a continuation of the left hand side aisle to a back exit. The vestibule has several wall monuments.

Occupying the far wall of the niche on the right is the early 14th century tomb, in Gothic style, of the Spanish cardinal Gonzalo Gudiel, Archbishop of Toledo and Cardinal Bishop of Albano, who died in 1299. His remains were transferred to the metropolitan cathedral in Toledo in 1301. The work as a whole is thought to be of the school of Arnolfo di Cambio.