The 22-year-old has overcome the back injury that brought his World Cup to a premature end.
The 22-year-old saw his World Cup campaign ended at the quarterfinal stage following a collision with Colombia's Camilo Zuniga in early July.
But after just under six weeks of rehabilitation, Neymar joined the rest of his teammates for full training Monday, along with new signing Jeremy Mathieu and Xavi, who have also overcome knocks.
MORE: Biggest summer transfers | Soccer's beautiful fans | WAGs
Defender Thomas Vermalean, who arrived at the club from Arsenal in a 19 million euro deal Saturday, didn't train and instead underwent physiotheraphy work as he comes back from a hamstring injury.
Barca begins its quest to regain La Liga when it hosts Elche on Aug. 24, in what will be Luis Enrique's first official match in charge.