"I think the Argentinians felt a bit frustrated that they weren't getting through and it was important we equalized so quickly".
The biggest shock yet of the ongoing World Cup in Russian Federation happened on Saturday when lowly Iceland held Argentina to a 1-1 draw in the first Group D match of the competition. His most recent World Cup goal was in the same game when he scored a minute into stoppage time to close the first half.
Messi's Argentina were held to a surprise 1-1 draw against Iceland.
Given the Argentina captain's unspectacular record from the spot, some supporters expected Sergio Aguero, who opened the scoring, to take the penalty but Messi pulled rank.
But Messi is a man on a mission as he chases his first World Cup winner's medal and will not tolerate complacency against the minnows at Moscow's Spartak stadium.
Mourinho has reiterated that Messi is a human for whom the missed penalty will have a significant psychological impact for the remainder of the tournament.
He stood on the pitch on his own after the final whistle for a long while, but Aguero said Messi's penalty struggles only "show he's human" and backed him to recover before they face Croatia on Thursday.
Messi's miss Saturday was his fourth missed penalty in his last seven attempts for Argentina and Barcelona.
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Messi had two more chances as the match stretched into its final 10 minutes.
At the end, Messi retreated alone into the center circle with his head bowed and hands on his knees.
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The Group D opener between Argentina and Iceland could have been billed as "The Vikings" versus "The King" such had been the focus on leading man Lionel Messi to finally win an worldwide tournament with La Albiceleste.
Griezmann's well-struck shot was the first VAR-awarded penalty at a World Cup.
"It's going to be a very hard match", Modric said afterwards.
Iceland, ranked 17 places behind Argentina at 22nd in the world, topped their group in European qualifying with comfortable wins over Croatia, Ukraine and Turkey.