  We implement a minimal linear seesaw model (LSM) for addressing the
Quasi-Dirac (QD) behaviour of heavy neutrinos, focusing on the mass regime of
$M_{N} \lesssim M_{W}$. Here we show that for relatively low neutrino masses,
covering the few GeV range, the same-sign to opposite-sign dilepton ratio,
$R_{\ell \ell}$, can be anywhere between 0 and 1, thus signaling a Quasi-Dirac
regime. Particular values of $R_{\ell \ell}$ are controlled by the width of the
QD neutrino and its mass splitting, the latter being equal to the
light-neutrino mass $m_{\nu}$ in the LSM scenario. The current upper bound on
$m_{\nu_{1}}$ together with the projected sensitivities of current and future
$|U_{N \ell}|^{2}$ experimental measurements, set stringent constraints on our
low-scale QD mass regime. Some experimental prospects of testing the model by
LHC displaced vertex searches are also discussed.
