  Noncentrosymmetric materials are promising paradigm to explore unconventional
superconductivity. In particular, several Re containing noncentrosymmetric
materials have attracted considerable attention due to a superconducting state
with a broken time reversal symmetry. A comprehensive study on the
superconducting ground state of NbReSi was investigated using magnetization,
resistivity, and muon spin rotation/relaxation measurements. Zero field muon
spectroscopy results showed the absence of any spontaneous magnetic field below
the superconducting transition temperature, T$ _{c} $ = 6.29 K, indicating the
preserved time-reversal symmetry. Transverse field muon spin rotation
measurements confirms a s-wave nature of the sample with $\Delta(0)/k_{B}T_{c}
$ = 1.726. This study urges further investigation on more noncentrosymmetric
materials to elucidate the selective appearance of unconventional nature and
unveil its dependence on antisymmetric spin-orbit coupling strength.
