The simple future tense of the verb ‘play’ is ‘will play’.
To form the simple future tense, you typically use ‘will’ followed by the base form of the verb. In this case, since ‘play’ is already in its base form, you simply add ‘will’ in front of it. For example, you might say, ‘I will play soccer tomorrow.’ This construction indicates an action that will take place in the future.