He has now played in midfield behind two of the best players of all time, who have 11 Ballon d’Ors between them, putting him in a good position to compare the duo.
The 21-cap Brazilian international has stated Ronaldo is more personable than his Argentine counterpart.
He told AS: ‘They’re champions above all else. In this, Messi and Ronaldo are identical. Concentrated from start to finish, always.
‘If they score three goals, they immediately think of the fourth. They never disconnect. It’s impressive and at the same time motivating, because they push you to do your best.
‘Compared to Messi, Ronaldo talks more and is more accessible. He never backs down if there is a team-mate in need, and he inspires fierce determination.
‘He trains like an animal, he doesn’t know what a break is, and he always encourages you to do your best. He leaves nothing to chance.’
Messi’s Barcelona lost 3-0 at home to Ronaldo’s Juventus in a costly defeat which saw Juventus take top spot in Champions League Group G.
The Argentine, 33, will battle Ronaldo, 35 and Robert Lewandowski for the FIFA The Best award, which comes as a surprise after Barcelona’s disappointing year.
Messi tried to leave the Catalan club last summer, and with his contract expiring next summer, has been linked with leaving.
Reports suggest the star forward’s discontent has unsettled other members of the side, who lie a hugely disappointing ninth in LaLiga.