  We present an ab initio $GW$ self-energy calculation of the electronic
structure of LaNiO$_2$. With respect to density-functional theory we find that
in $GW$ the La 4$f$ states undergo an important $+$2 eV upward shift from the
Fermi level, while the O 2$p$ states are pulled down by $-$1.5 eV, thus
reinforcing the charge-transfer character of this material. However, $GW$
many-body effects leave the $d$-like bands at the Fermi level almost
unaffected, so that the Fermi-surface topology is preserved, unlike in
cuprates.
