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Based on the information you’ve given his chances are probably quite low but it is not impossible for him to be given a visa. However, even with you acting as his sponsor he will need to show that he qualifies in his own right and, possibly most importantly, has strong ties to home that will be sufficient to convince UKVI that he will return home at the end of his visit. You will likely also need to demonstrate a relationship of a reasonable length as a reason for inviting him. Reading this UK visa refusal on V 4.2 a + c (and sometimes 'e') may help you understand the challenges better, plus this guide https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/673351/Visit-guidance-v7.0EXT.PDF#page1