I personally would do everything possible to avoid this. It is likely that your employer will recognise the piece from a tutorial and that may reflect badly on your ability to create good work without a tutorial.
I would advise against it, when making from a tutorial someone else has done all the heavy lifting for you, a bit like connecting the dots. Instead take what you have learned from the tutorials and make your own piece
If you're precisely following a tutorial, then yeah, I wouldn't include it in a portfolio. If you're using a tutorial as reference to model something similar but not identical, it'd be fine to put it in a portfolio (you'll probably learn more, too).
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Instead take what you have learned from the tutorials and make your own piece