  It is generally thought that pion masses vanish when bare light quark masses
$m_q$ vanish. The pions are Nambu-Goldstone bosons of chiral $SU_{A}(2)$
symmetry. We discuss a possibility that even when $m_q=0$, the chiral symmetry
is explicitly broken in strong coupled QCD, while it is not in weakly coupled
QCD. The point is that QCD monopoles are dynamical degrees of freedom in the
strong coupled QCD. We show that the monopole quark interactions break the
chiral $U_5(1)$ symmetry as well as the chiral $SU_{A}(2)$ symmetry. They are
weak relative to the other chiral symmetric interactions of quarks and gluons.
These weak interactions produce small pion masses as well as quark masses $\sim
20$MeV in the phase with the monopole condensation. The presence of the
interactions modifies the Gell-Mann Oakes Renner relation. Using the relation
we predict the value $(-\langle\bar{q}q\rangle)^{1/3}\simeq 160$MeV. We also
show that the monopole quark interactions do not prevent the monopole
condensation in dual superconducting model.
