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Models of planet formation and disc evolution predict a variety ofobservables in the dust structure of protoplanetary discs. Here we presentAtacama Large Millimeter/submillimeter Array (ALMA) Band-6 and Band-7observations of the transition disc Sz\,91 showing that the continuum emissionat 870$\mu$m, which is dominated by emission from large dust grains, islocalized in an optically thin narrow ring. We find that most of the emission($\sim95\%$) is concentrated in a ring located at 110 au from the central starthat is only about 44 au wide. In contrast, the $^{12}\mathrm{CO}$ (2-1)emission peaks closer to the star and is detected up to $\sim488$ au from thestar. The concentration of large grains in a ring-like structure while the gasdisc extends much further in and further out is in qualitative agreement withpredictions of hydrodynamical models of planet-disc interactions includingradial drift and gas drag.

A ring-like concentration of mm-sized particles in Sz 91