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Three galaxy clusters selected from the XXL X-ray survey at high redshift andlow mass ($z\sim1$ and $M_{500} \sim 1-2 \times 10^{14}$ M$_{\odot}$) wereobserved with NIKA2 to image their Sunyaev-Zel'dovich effect (SZ) signal. Theyall present an SZ morphology, together with the comparison with X-ray andoptical data, that indicates dynamical activity related to merging events.Despite their disturbed intracluster medium, their high redshifts, and theirlow masses, the three clusters follow remarkably well the pressure profile andthe SZ flux-mass relation expected from standard evolution. This suggests thatthe physics that drives cluster formation is already in place at $z \sim 1$down to $M_{500} \sim 10^{14}$ M$_{\odot}$.

NIKA2 observations of 3 low-mass galaxy clusters at $z \sim 1$: pressure profile and $Y_{\rm SZ}$-$M$ relation