  Monopoles have recently been discussed to be a dominant component in strong
coupled quark gluon plasma ( QGP ) and to play a role for chiral symmetry
breaking as well as quark confinement. We analyze monopole quark interactions
and show that massless quarks colliding with the monopoles inevitably change
their chiralities keeping their flavors. The monopole quark interaction
explicitly breaks the chiral symmetry ( SU$_A(2)\times $U$_A$(1) ) just like
bare quark masses. It is given by $\bar{q}q\Phi^{\dagger}\Phi$ with the
monopole field $\Phi$. The pions are not Nambu-Goldstone bosons even in the
vanishing bare quark masses. Their masses are mainly determined by the
interaction because the monopole condensation generates a larger current quark
mass than the bare quark masses. Based on the analysis of the monopole quark
interaction, we propose a phenomenological linear sigma model coupled with the
monopoles. The monopoles couple only with isoscalar scalar mesons e.g. sigma
meson $\sigma$ such as $\sigma\Phi^{\dagger}\Phi$ indicated by the monopole
quark interaction. The coupling explicitly breaks the chiral SU(2)$_A\times
$U$_A$(1) symmetry. Pion masses are generated by the chiral condensate, which
arises only when the monopole condensate takes place. We show that one of the
monopoles is a color singlet and observable. The monopole decays into hadrons (
pions, kaon, etc. ) through the coupling. Our analysis indicates that
$f_0(1500)$ meson is a candidate of the observable monopole. As
phenomenological effects of these monopoles, we point out that the masses of
hadrons decrease in dense nuclear matters and that chiral magnetic effects
disappear in strong coupled QGP.
