I have spoken to him he says he will cover the shift.
I have spoken to him he said he will cover the shift.
Both tenses are possible. In both of your examples, you hav incorrectly joined two separate sentences together. The common term for this error is that you have written a run-on sentence.
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Both tenses are possible.
In both of your examples, you hav incorrectly joined two separate sentences together. The common term for this error is that you have written a run-on sentence. You could joint hem correctly by eg using 'and'.