Barcelona seem to be close to signing Griezmann with reports saying the France international has agreed to move to the Nou Camp.
Manchester United have long been interested in signing the striker but it appears their transfer pursuit may end in heartbreak.
But Spanish website Don Balon say any deal that would see Griezmann move to Catalonia hinges on Messi.
And that is said to be because the France international wants to know if his Argentinean rival would have any issues with him making the move to Barcelona.
With his future shrouded in uncertainty, Messi’s stock has never been higher.
The 30-year-old has scored 12 La Liga goals already to propel Ernesto Valverde’s side to the top of the league table, eight points clear of defending champions Real Madrid.
How Barcelona could look with Antoine Griezmann
Sun, November 12, 2017
Is this how Barcelona could look with Antoine Griezmann?
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How would Barcelona look if they sign Antoine Griezmann?
And Don Balon say Messi’s blessing is key to Griezmann agreeing to join Valverde’s men.
It is said he is also after a contract with a significant wage hike.
He supposedly wants a wage befitting of a player of his stature and close to the salary Neymar received during his time at Barcelona.
Additionally, he also wants a guarantee of game time.
Barcelona usually play with one out and out striker in the form of Luis Suarez.
And any move for Griezmann would likely see the former Liverpool star drop down the pecking order.
Barcelona news: Lionel Messi must give his blessing to Antoine Griezmann
Barcelona news: Antoine Griezmann wants the blessing of Lionel Messi
Meanwhile, Atletico boss Diego Simeone vented his fury at Griezmann earlier this month by saying he had no matchwinners at his disposal.
"We do not have a player that wins us matches,” he said.
"We don't depend on one footballer, a team needs everybody to be involved.
"We have always been fine because the team pushed each other accordingly.
"We have to keep our concentration in the decisive moments of matches.
"In some passages of games we have lost our concentration, we can't afford to do this.
"We will continue working in the same manner as always, we need people who think about the team."