Ousmane Dembele arrived back in Barcelona three weeks after becoming a world champion with France.
The 21-year-old forward cut short his holidays and went straight back into training on Saturday with the other players not on the club's tour of the USA.
Dembele worked with Messi, Pique, Busquets, Alba and Samper to try and build fitness ahead of the Spanish Super Cup, a week away.
Coutinho, Rakitic and Umtiti remain away and will be back soon, along with new signing Arturo Vidal.