Pep Guardiola, prepping for Manchester City's Champions League test at Atalanta on Wednesday, while also undoubtedly plotting for the weekend's titanic showdown at Anfield, will have seen a familiar and unwelcome sight.

Just under an hour into Liverpool's 2-1 home victory over Genk on Tuesday, Alex Oxlade-Chamberlain collected Mohamed Salah's fleet-footed lay-off and swivelled before driving a shot into the bottom corner.

That goal, his fourth in the last three starts, was the winner and crowned a dynamic performance that served as a throwback of the midfielder's best form prior to sustaining multiple ligament damage in April 2018.

That robust, ball-carrying and line-breaking version of "Ox" is one Guardiola knows well and will not want to see in Jurgen Klopp's starting XI on Sunday. After all, the player's last two goals for Liverpool prior to his lengthy sideline spell came during inspired displays against City.

The first -- ghosting past Fernandinho before guiding an early rocket beyond Ederson into the bottom corner -- was a highlight in the 4-3 league win at Anfield in Jan. 2018, which ended the visitors' 22-match unbeaten run in the Premier League.

The 26-year-old produced more of the same in Liverpool's 3-0 home victory in the Champions League quarterfinal first-leg, which was the club's first game since Philippe Coutinho's move to Barcelona.