  Recently the LHCb experiment found evidence for the existence of two exotic
resonances consisting of $c\bar{c}uud$ quarks. Among the possible
interpretations is the hadro-charmonium model, in which charmonium is bound
"within" a light hadron. We test this idea on CLS $N_f$=2+1 lattices using the
static formulation for the heavy quarks. We find that the static potential is
modified by the presence of a hadron such that it becomes more attractive. The
effect is of the order of a few MeV.
