The potential use of commercial fibres (pea fibre (PF), inulin (I) and their blends (PFI)), as fibre- enriching agents in frozen/thawed mashed potatoes (F/TM potatoes), was reported. PF and I supplementations conferred hardness and softness to the product respectively. Differences were attributed to the relationship of the fibre with the potato starch matrix. The association of PF at low concentration (< 15 g/kg mashed potatoes) and I at high concentration (> 45 g/kg) is strongly encouraged to fortify the diet without promoting negative effects on textural and rheological properties of F/TM potatoes or colour and overall acceptability of the resulting products.