Credible means something that is believable or capable of being believed; believable. For example, credible evidence refers to evidence that is worthy of belief or trustworthy. In the question this means that the sponsor denial or the explanation of it, is believable or trustworthy.
Securing a Sponsor Licence is a powerful enabler for hiring international talent—but it also imposes ongoing responsibilities and scrutiny. The Home Office wants to ensure that only credible, compliant, and well-structured businesses are entrusted with the authority to sponsor others.
not credible!
Denial of materialism
Denial - outright rejection. --- Note that denial is also used in the sense of dogmatic refusal to believe (something). Well known examples include Holocaust denial and climate change denial.
more credible, most credible
That is the correct spelling of "credible" (believable).
Facebook is both, a credible site + an non credible site
Frank was your sponsor
There is no such word, or a need for one. The word "sponsor" is already a noun applied to a person, group, or company.
He was denial of women rights. He was in denial of his committed bad deeds. He committed the act even though of his continuous denial.
The local grocery store is a sponsor of our school.
denial clause