Collocations for credible - adj.

appear, be, seem
become
make sth
find sth
I'm not sure that I find her story credible.

highly, very
completely (esp. BrE), fully (esp. AmE), quite
You need imagination to make what you write fully credible.

barely (esp. BrE), hardly, scarcely (esp. BrE)
It seems hardly credible that anyone could have walked so far in a day.

Credible is used with these nouns:
allegation, alternative, argument, deterrent, evidence, explanation, information, report, testimony, threat, witness