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We quantify the relative importance of environmental quenching versuspre-processing in $z\sim1$ clusters by analysing the infalling galaxypopulation in the outskirts of 15 galaxy clusters at $0.8<z<1.4$ drawn from theGOGREEN and GCLASS surveys. We find significant differences between theinfalling galaxies and a control sample; in particular, an excess of massivequiescent galaxies in the infalling region. These massive infalling galaxieslikely reside in larger dark matter haloes than similar-mass control galaxiesbecause they have twice as many satellite galaxies. Furthermore, thesesatellite galaxies are distributed in an NFW profile with a larger scale radiuscompared to the satellites of the control galaxies. Based on these findings, weconclude that it may not be appropriate to use 'field' galaxies as a substitutefor infalling pre-cluster galaxies when calculating the efficiency and massdependency of environmental quenching in high redshift clusters. By comparingthe quiescent fraction of infalling galaxies at $1<R/R_{200}<3$ to the clustersample ($R/R_{200}<1$) we find that almost all quiescent galaxies with masses$>10^{11}M_{\odot}$ were quenched prior to infall, whilst up to half of lowermass galaxies were environmentally quenched after passing the virial radius.This means most of the massive quiescent galaxies in $z\sim1$ clusters wereself-quenched or pre-processed prior to infall.

Satellite quenching was not important for z$\sim$1 clusters: most quenching occurred during infall