Capello spoke after Barca's Champions League win at Juventus about the Argentine's attitude.
"I saw a super-dynamic and aggressive Barca, on top of the known quality," he explained. "With a Messi who I have never seen run so much."
Barca coach Ronald Koeman certainly wants his team to work hard and Messi is no exception.
"Juventus suffered a lot and were lucky that the final result was only 2-0, despite that the two goals were unjust, especially the first, a deflection," added Capello.