Which proforms have "Tom" as antecedent in "When Tom won, his friends cheered for him"

Question

When Tom won the talent contest, his friends cheered for him.

In this sentence, what is the pronoun that matches the antecedent Tom? I suspect it is "him", but can it also be "his" in this case?

Answer 1

This sentence could be expanded into:

When Tom won the talent contest, Tom's friends cheered for Tom.

Thus both "his" and "him" ultimately refer to "Tom".

Answer 2

The referent of his is the implied Tom's.