Final answer:
The noun clause 'whoever scores the first goal' in the sentence works as an indirect object, providing more details concerning the action.
Step-by-step explanation:
In the sentence provided, 'whoever scores the first goal' is a noun clause which plays the role of the indirect object in the sentence. In the grammatical structure of this sentence, the noun clause is the entity to which the action of the verb (giving) is directed. The main clause in this sentence is 'The coach will give a disc signed by Joel Silver', where actions are happening, while the noun clause 'whoever scores the first goal' provides additional essential details about the action.
Learn more about Noun Clauses