A prized attacking pair worked individually as the Blaugrana began preparations for a crucial last 16 showdown next month
The French duo have both been sidelined with injuries but underwent individual recovery work as they continued their rehabilitation.
Griezmann suffered a thigh problem in the 1-0 win over Real Valladolid on July 11, forcing him to miss the final two La Liga games of the campaign as Barca were dethroned by Real Madrid during the run-in.
As for Dembele, his season was seemingly over when he underwent surgery to repair his damaged hamstring back in February.
However, the extension of the 2019-20 campaign due to the coronavirus pandemic has raised the possibility of the winger featuring in Europe.
Ciutat Esportiva Joan Gamper
Back to work! pic.twitter.com/ZlXxC8kO28
— FC Barcelona (@FCBarcelona) July 28, 2020
Meanwhile, defender Clement Lenglet also worked away from the rest of the group, with the centre-back attempting to overcome a groin injury suffered on the last day of the league campaign.
Barca are beginning preparations for the delayed second leg of their last-16 tie against Napoli, which is to be played on August 8 at Camp Nou. The teams drew 1-1 in the first meeting, which took place on Italian soil at Stadio San Paolo in February.
The subsequent knockout rounds will take place in Portugal, all as one-off games following changes to the schedule caused by the COVID-19 crisis.
Lionel Messi questioned Barca’s chances of beating Napoli after their failure to retain the La Liga title, telling reporters after a shock defeat to Osasuna: “We are Barca and we have to win everything.
“We can’t look at Madrid…Madrid have done their job, but we have helped them a lot.
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“If we want to win the Champions League, we have to change a lot. If we continue like this, we will lose the game against Napoli.”
The German outfit already have one foot in the last eight after thrashing the Blues 3-0 at Stamford Bridge in the first leg of their round of 16 encounter back in February.