  Most of the progress in high-energy Quantum Chromodynamics has been obtained
within the eikonal approximation and infinite Wilson-line operators. Evolution
equations of Wilson lines with respect to the rapidity parameter encode the
dynamics of the hadronic processes at high energy. However, even at high energy
many interesting aspects of hadron dynamics are not accessible within the
eikonal approximation, the spin physics being an obvious example. The higher
precision reached by the experiments and the possibility to probe spin dynamics
at future Electron Ion Colliders make the study of deviations from eikonal
approximation especially timely. In this paper I derive the sub-eikonal quark
and gluon propagators which can serve as a starting point of studies of these
effects.
