  Despite continuous increasing of the number of ICRF sources, their sky
coverage is still not satisfactory. The goal of this study is to discuss some
new considerations for extending the ICRF source list. Statistical analysis of
the ICRF catalog allows us to identify less populated sky regions where new
ICRF sources or additional observations of the current ICRF sources are most
desirable to improve both the uniformity of the source distribution and the
uniformity of the distribution of the position errors. It is also desirable to
include more sources with high redshift in the ICRF list. These sources may be
of interest for astrophysics. To select prospective new ICRF sources, the OCARS
catalog is used. The number of sources in OCARS is about three times greater
than in the ICRF3, which gives us an opportunity to select new ICRF sources
that have already be tested and detected in astrometric and geodetic VLBI
experiments.
