The Brazilian, who is currently recovering from a hamstring injury, played 45 minutes against the Arsenal U23 side before the international break and provided some invaluable education for Brannagan.
"I've played alongside Lucas in a two in midfield in the past but he played as a centre-back against Arsenal," Brannagan told Sky Sports.
"He was unbelievable leading from the back with the way he dealt with their centre-forwards and the way he played the ball through midfield and up to the strikers.
"Having him in the team is a big boost because he's a great player and is established and he's been in the game now for many years. He's a top professional who helps the youngsters through the game a lot. We need that and can learn a lot from people like him."