Philippe Coutinho presented with a thigh injury during a medical with his new club Barcelona, which the Spanish side says will keep him sidelined for around 20 days.
Coutinho was undergoing his routine medical tests with Barca on Monday morning as he put the finishing touches on his record-breaking move to the Nou Camp.
The Brazil international missed both of Liverpool's opening two games in 2018 with a thigh problem and Barca have confirmed he is now set to be sidelined for the rest of January.
A club statement read: "Coutinho has an injury to his right thigh and he is expected to be out for around three weeks."
Coutinho was due to sign a five-and-a-half-year contract with the Catalan giants following his medical before being officially presented this afternoon.
The switch will see Coutinho become the second most expensive footballer in history after Liverpool and Barca agreed a deal for the playmaker which could be worth up to £142million.
It is the biggest transfer fee involving a British club and is also the most Barca have ever paid for a player, eclipsing the £96.8million - rising to a possible £135.5million - they splashed out on Borussia Dortmund winger Ousmane Dembele last August.