Although discourse properties of aphasic patients have been investigated utilizing microlinguistic as well as macrolinguistic approaches, there have been only a few studies in the Persian setting which have tried to investigate discourse properties of these brain-damaged patients. In this respect, the previous researchers mainly concentrated on the two most notorious types of aphasia, namely Broca and Wernicke. In this respect, the coherence properties of transcortical motor patients have never been taken into consideration seriously by the scientists. This research, utilizing a mixed-methods approach, tries to investigate whether and how transcortical aphasia patients differ from their healthy counterparts in the cohesive properties of their discourse with the aim of presenting an exhaustive account of the issue and filling the existing gap in the literature. In doing so, cohesive devices in the discourse of six transcortical motor aphasics (3 participants of each gender, mean age, 56. 9) and 6 healthy non-aphasic controls (3 participants of each gender, mean age= 57.4) were compared. The results corroborate our hypothesis demonstrating that the discourse of transcortical aphasics is less cohesive than that of healthy individuals and they have lots of challenges in constructing grammatical cohesive devices. Our findings demonstrate that discourse could be differently disrupted in diverse forms of aphasia. We recommended that the conduction of more researches in different languages could shed more light on the issue enriching our understanding of the nature of the disease.