  We investigate the temperature dependence of the upper critical field $H_{c
2} $ as a tool to probe the possible presence of multiband superconductivity at
the interface of LAO/STO. The behaviour of $H_{c 2} $ can clearly indicate
two-band superconductivity through its nontrivial temperature dependence. For
the disorder scattering dominated two-dimensional LAO/STO interface we find a
characteristic non-monotonic curvature of the $H_{c 2} (T) $. We also analyse
the $H_{c 2} $ for multiband bulk STO and find similar behaviour.
