  The optical design of the Einstein Telescope (ET) is based on a dual-recycled
Michelson interferometer with Fabry-Perot cavities in the arms. ET will be
constructed in a new infrastructure, allowing us to consider different
technical implementations beyond the constraints of the current facilities. In
this paper we investigate the feasibility of using beam-expander telescopes in
the interferometer arms. We provide an example implementation that matches the
optical layout as presented in the ET design update 2020. We further show that
the beam-expander telescopes can be tuned to compensate for mode mismatches
between the arm cavities and the rest of the interferometer.
