Sahal made an immediate impact in his debut match against Curacao in the King's Cup in June and within four months, he has become the mid-field pivot of the Indian football team.
Messi, meanwhile, is in doubt for Tuesday's Champions League clash against Borussia Dortmund as he has yet to recover from the calf injury he picked up in August, coach Ernesto Valverde said.
Neymar cost PSG a world record 222 million euro in August 2018 when he joined the French club from Barcelona.
Messi, Barca's record goalscorer, is currently out injured with a calf injury, with the team struggling in his absence, managing to collect just four points from their opening three La Liga matches.
The Dutch international denied Cristiano Ronaldo and Lionel Messi for the European title last week and the same trio are in the running for the FIFA accolade to be announced in Milan on September 23.
Liverpool's Virgil van Dijk was named 2019 UEFA Men's Player of the Year, beating Messi and Ronaldo at the same stage.
Barcelona, Dortmund and Inter, with nine European Cups between them, were drawn together in Group F along with the Czech champions Slavia Prague.
Griezmann imitated the basketball superstar by tossing confetti into the air to celebrate his second at Camp Nou, a curling effort into the corner that he said was inspired by watching Messi.
Barcelona coach Valverde wants more from Antoine Griezmann as Lionel Messi doubtful to face Real Betis
Messi has returned to training this week after the Argentinian sustained a calf injury on August 5 and missed the whole of Barca's pre-season.
Suarez and Dembele both picked up strains against Bilbao while Griezmann delivered the sort of hesitant display to suggest he may also need time to adapt.
Cristiano Ronaldo and Lionel Messi have won the coveted Ballon d'Or five times each, a factor that helps each player flourish.
Messi trained alone in the morning before joining his team-mates in the afternoon, increasing hopes that Barca's captain could play a role against Real Betis in La Liga on Sunday.
Messi, who has yet to win the award, earned a seventh nomination with a delicate chip for Barcelona against Betis in Seville.
Suarez hobbled off in the 37th minute against Bilbao, leaving Barca without their two premium strikers for the start of the defence of their La Liga title.
Messi is currently suffering from a calf strain and due to this he even missed Barcelona's trip to the United States.