  Recently, superconductivity was discovered in the infinite layer of
hole-doped nickelates NdNiO$_{2}$. Contrary to this, superconductivity in
LaNiO$_{2}$ is still under debate. This indicates the crucial role played by
the $f$ electrons on the electronic structure and the pairing mechanism of
infinite-layer nickelates. Here we discuss the role of the electron
correlations on the $f$ electron states and their influence on the electronic
structure. We show that the lattice parameters are in good agreement with the
experimental values, independent of the chosen parameters within the DFT+$U$
approach. Increasing Coulomb interaction $U$ tends to shift the $f$ states away
from the Fermi level. Surprisingly, independently of the position of $f$ states
with respect to the Fermi energy, these states play an important role in the
electronic band structure, which can be reflected in the modification of the
NdNiO$_{2}$ effective models.
