The first benefit of Fernando's move is the rotation now available to Pellegrini in midfield.
Yaya Toure and Fernandinho were relied on too heavily last season. Fernando's arrival will allow them to rest more often, which will provide a huge boost to City's chances of successfully juggling the demands of four competitions.
Javi Garcia was City's only real replacement for their first-choice midfield pair last year. He performed admirably, particularly in the second half of the campaign, but doubts remain over his long-term suitability to English football.
His mobility is lacking, and with pace in midfield now almost a prerequisite for playing in the Premier League, he has failed to convince everyone he has the necessary quality to be part of a successful City side on a long-term basis.
Fernando solves the issue. He has everything needed to cope with the demands of English football and should provide sterner competition in City's midfield.