The talented midfielder joins his team-mates in time for the second leg of the Spanish Supercopa in Madrid on Wednesday
The gifted youngster joined in with first-team training on Monday, being coached by new boss Tito Vilanova, as the Barca squad begin preparations for the Spanish Supercopa match against rivals Real Madrid.
The international has not featured for the Catalan giants since injuring his tibia during the Copa del Rey final last season.
Thiago has made 41 first-team appearances for Barcelona, scoring on five occasions. The 21-year-old midfielder has also represented his country three times at senior level.