  We constrain the Chameleon \textit{screening} mechanism in galaxy clusters,
essentially obtaining limits on the coupling strength $\beta$ and the
asymptotic value of the field $\phi_{\infty}$. For this purpose, we utilized a
collection of the 9 relaxed galaxy clusters within the X-COP compilation in the
redshift range of $z \le 0.1$. We implement the formalism assuming an NFW mass
profile for the dark matter density and study the degeneracy present between
the mass $\M$ and the chameleon coupling with a high degree of improvement in
the constraints for excluded parameter space. We recast our constrain to an
upper limit on the scalaron field in \fofr sub-class of models of $|f_{R0}|\le
9.2\times 10^{-6}$, using all the nine clusters and $|f_{R0}|\le 1.2\times
10^{-5}$ using only 5 clusters with WL priors taken into account, at a $95\%$
confidence level. These bounds are consistent with existing limits in the
literature and tighter than the constraints obtained with the same method by
previous studies.
