  Current-driven spin torques in metallic spin-valves composed of
antiferromagnets are theoretically studied using the non-equilibrium Green's
function method implemented on a tight-binding model. We focus our attention on
G-type and L-type antiferromagnets in both clean and disordered regimes. In
such structures, spin torques can either rotate the magnetic order parameter
coherently (coherent torque) or compete with the internal antiferromagnetic
exchange (exchange torque). We show that, depending on the symmetry of the
spin-valve, the coherent and exchange torques can be either in the plane,
{\alpha} n\times(q \times n) or out of the plane {\alpha} n \times q, where q
and n are the directions of the order parameter of the polarizer and the free
antiferromagnetic layers, respectively. Although disorder conserves the
symmetry of the torques, it strongly reduces the torque magnitude, pointing out
the need for momentum conservation to ensure strong spin torque in
antiferromagnetic spin-valves
