The Reds' two latest signings played 45 minutes apiece as Jürgen Klopp's side ran out comfortable winners at the Swansway Chester Stadium.
Harry Wilson scored twice before the break, with James Milner's penalty, a Daniel Sturridge double and goals from Ryan Kent and Danny Ings arriving in the second half.
Fabinho was named in Klopp's first-half team and cracked the post with a low drive, while Keita took to the field for the second 45 minutes.
Take a look at a selection of the best photographs of the duo's Liverpool debuts below.