Striker will still join the Spain squad for Portugal friendly
The 26-year-old sustained the injury during the second-half of the game, but managed to continue and play until the final whistle.
The club has now confirmed that the former Atletico Madrid man will link up with the Spain squad for their upcoming international friendly with Portugal, where he will be assessed by the national team's medical staff.
A statement on the club's official website reads: "Fernando Torres sustained an ankle ligament strain during Saturday's clash with Stoke City - but the striker will still join up with the Spain squad for their international with Portugal.
"The Reds' medical team have been in contact with their Spanish counterparts to keep them up to date on the 26-year-old's condition.
"Torres will have the injury further assessed by the Spanish medical staff ahead of the friendly in Lisbon on Wednesday."