After Inter's thrilling victory over Bayern Munich, Capello believes they have the firepower and the coach, Simone Inzaghi, to take on the mighty Catalans.
He told La Gazzetta dello Sport: "Flick's team is packed with quality, but they're not as Spanish as they used to be. They love vertical play and pressing, but that's also their weakness."
Capello believes the key is to exploit the spaces they leave and keep the ball away from Barcelona's dangerous trio of Lewandowski, Raphinha, and Yamal.
"The secret is to overcome their pressure line," Capello said. "Lautaro and Thuram need to be on point, and set pieces could be their secret weapon."
When it comes to stopping Barcelona's attack, Capello says it's all about focus and attention. "If Inter can do it against Messi, they can do it against Yamal."
Capello also sees the return match at the Meazza as a potential game-changer. "The home crowd can make all the difference in the final minutes," he said.