  In this paper we study the effect of new physics contributions to the top
quark pair production ($t\bar{t}$) in a possible future linear collider, such
as the International Linear Collider (ILC). The use of a dimension-six gauge
invariant effective operator approach allows to compare the prospected results
at the ILC with the current ones obtained at the Large Hadron Collider (LHC),
both in neutral and charged current processes. We also prove that the use of
specific observables, together with a combination of measurements in different
polarized beam scenarios and with different center-of-mass energies, allows to
disentangle different effective operator contributions and significantly
improve the limits on the anomalous couplings with respect to the LHC.
