The Chile international took to social media this week to post a picture of himself working out in a deserted gym at Arsenal’s London Colney training base.
Arsenal are preparing to host their top-four rivals at The Emirates on Friday night as they look to try and gain revenge for their 4-0 thrashing by the Reds at Anfield back in August.
Sanchez has been in good form for Arsenal so far this season, with the 29-year-old having scored four goals and made three assists in the Premier League this term.
He will be hoping to be in his best possible form when the Gunners take on Liverpool FC in the top flight on Friday night, and he looked to be in good spirits as he posed for a selfie in the gym ahead of the game.
Arsenal head into the game in fifth place in the Premier League table but know that a win would move them above Liverpool FC into fourth spot over Christmas.
The Gunners finished fifth last term but won the FA Cup under Arsene Wenger.
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