The structural and magnetic properties of LaCo0.9Mn0.1O3 have been studied as a function of pressure by neutron powder diffraction and DC magnetometry. The material is confirmed to exhibit rhombohedral R (3) over barc symmetry between ambient pressure and 6 GPa. We have determined the bulk modulus B-0 of the sample using a second-order Birch-Murnaghan equation of state which yielded: B-0 = 140(9) GPa and V-0 = 112.7(2) angstrom(3). We report a non-linear increase of the Curie temperature T-C from an ambient pressure value of 224.7 K to similar to 236 K at a pressure of 4 GPa. Finally, we confirm the glassy-like nature of the magnetism in LaCo0.9Mn0.1O3, which is maintained throughout the pressure range explored.