  It is shown in the framework of an extended NJL model with two flavors that
some types of external chromomagnetic field induce the dynamical chiral or
color symmetry breaking even at weakest attraction between quarks. It is argued
also that an external chromomagnetic field, simulating the chromomagnetic gluon
condensate of the real QCD-vacuum, might significantly influence the color
superconductivity formation.
