Real Madrid midfielder Casemiro said manager Rafael Benitez was a key factor in re-signing with the Spanish giant.
The 23 year-old signed on with Madrid until 2021, despite a clause in his loan deal with Porto last season which almost led to a permanent stay in the Primeira Liga.
The Brazil international, who he will play under his third manager at the Spanish giant, said he was impressed with Benitez.
"I learned a lot, also by working with Mourinho and with Ancelotti," Casemiro said.
"Now with Benitez, I am sure that it will be an incredible year and I am going to continue working to play more and more. I am very happy."
"He is a great manager. He always wants his players to give their best, whether in training or in games."
"He likes people to approach things seriously and we are on the right path."
Casemiro said last season at Porto, which saw him play 28 league games for three goals, was crucial for his development.
"It was a very important decision, for me and my family. Porto helped me a lot and now I return as a man and with more experience," he said.