The 32-year-old previously represented the Catalan giants for eight years between 2005 and 2013, coming through their La Masia ranks to make 100 appearances for La Blaugrana in all tournaments.
Thiago became a Champions League, La Liga and Club World Cup winner with Barcelona before being sold to Bayern Munich for £21.5m, and he established himself as one of Europe's most technically gifted midfielders while at the Allianz Arena.
Since leaving the Bundesliga behind for Liverpool in 2020, the Spain international has consistently struggled with injuries but has been a vital player for Jurgen Klopp's side when fit, banking three goals and six assists in 97 games.
However, Thiago — who has been out of action since April due to a severe hip injury — is now in the final six months of his Anfield deal and is therefore free to open discussions with foreign teams over a pre-contract agreement.
Thiago survived Liverpool's midfield revamp over the summer, but having failed to make a single appearance in the 2023-24 campaign, it is yet to be ascertained whether he will be offered a new contract on Merseyside.
A move to Serie A has been mooted for the 32-year-old, who has apparently caught the eye of Inter Milan and Juventus, but according to The Mirror, Barcelona are keen on a January reunion.
The reigning La Liga champions have been tipped to bring a new midfielder to Camp Nou ever since losing Gavi to a devastating ACL injury, which is expected to sideline the former Kopa Trophy winner for the rest of the season.
Back in November, Barca head coach Xavi confirmed his desire to sign a replacement
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