The Bayern No.1 missed the majority of the 2017/18 season through injury, but will captain the defending champions at the finals.
"He was exceptional at the 2014 World Cup and is Germany's key man," Griezmann told Spox. "He's also a leader and is very important for the inner workings of the team."
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Griezmann also gave his thoughts on Germany’s overall prospects.
"Once again, Germany have a strong team," the 27-year-old warned. "They'll almost certainly go as far as the semi-finals, from there it's the small details that determine whether you progress. They're certainly among the favourites."
Les Bleus lost 1-0 to Germany in the quarter-finals in Brazil four years ago, but took their revenge in the last four of UEFA EURO 2016.
The two countries cannot meet until the semi-final stage in Russia.