  Extreme mass-ratio inspirals, a target source for the space-based
gravitational wave detector LISA, are a sensitive probe of fundamental scalar
fields coupled to gravity. We assess the capability of LISA to detect whether
the secondary compact object is endowed with a scalar field, in the case of
inclined orbits. We show that the imprint of the scalar field depends on the
orbital inclination, and is significantly larger for prograde orbits.
