Your sentence doesn't make a lot of sense to me. The sentence suggests that the game requires more than just the one apple in order to be played. Whatever the case may be, I guess I'd avoid the problem completely and might say something like this: There will be an apple and, if any are available, some oranges used for the game.
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Cogar Hello all,There will be an apple, and some oranges, if any, that are going to be used for the game.
should it be singular or plural since oranges might not exist.
There will be an apple, and some oranges if any, that (is/are) going to be used for the game.