  In this comment, we have investigated that the power law variation of
Brans-Dicke scalar field $(\phi)$ with scale factor $(a)$ is not validated by
field equations in general for the Universe filled with dark matter and Tsallis
type holographic dark energy. However, for specific choice of free parameters
$(\omega = -\frac{3}{2}\;\; \&\;\; n = -1)$ which are differ from its values
fixed in Ghaffari et al \textcolor{blue}{[Ghaffari et al. Euro. Phys. J. C
\textbf{78}, 706 (2018)]} to describe various physical properties of the
Universe in derived model, the power law variation of $\phi$ with $a$ leads to
consistent results. Further, we notice that the energy conservation law for
Tsallis holographic dark energy in Brans-Dicke gravity does not hold.
