Manchester United midfielder Fred says playing with Cristiano Ronaldo is an "honour".
Fred has discussed how Ronaldo has improved the squad since his arrival.
"His [Ronaldo] impact was very positive," Fred told ESPN Brasil.
"It's obvious that in the first games, it was difficult for us, we had some defeats in some big matches, but I think his impact was very positive because a quality player, as great as Cristiano, being able to share the locker room, being able to have a day-to-day life with him, is very important.
"It's like I say, it's hard for you to get there, but it's even harder to keep up, and he stayed on top, he works for it. It's an honour to be able to work with him, to be able to share the locker room."
Sunday's matchwinner against Crystal Palace, Fred also said: "Everyone wants to have a great performance, both for themselves and the group, and if something goes wrong, we'll demand from ourselves.
"We had some defeats, after the games, we questioned ourselves there in the dressing room, he challenged the others, Bruno [Fernandes] challenged the others, I did, I demanded from myself too, I could have done better.
"So this is normal, if the performance isn't good, you have to have this self-criticism, for yourself as well as for others."