Manchester United star, Fred has revealed he was "annoyed" with the club's boss, Jose Mourinho for leaving him out of first-team.
Fred noted that his lack of action at Old Trafford cost him a place in Brazil's most recent squad.
Fred has struggled to make an impact at Old Trafford and has found himself on the sidelines in recent weeks.
Consequently, the player dropped from Brazil's squad that faced Uruguay and Cameroon in November - and he couldn't hid his frustration at the situation.
"I've played very little at United, so it's normal for Professor Tite not to be able to evaluate me, even though I've worked hard with him before," Fred told Sky Sports.
"Of course, I was annoyed, but I have to know how to deal with the sadness to be able to help me take a step forward.
While Fred was frustrated at Mourinho dropping him, he has vowed to prove himself at Manchester United and to not let his disappointment affect him.
"The coach has chosen not to put me in the team. That's his choice. I still do my job and I can't let it affect my mindset, I cannot let that shake me. I have to be patient.
"It's been a bit of a difficult start for me at United because I have not been playing so much.
"I had a lot of games in Shakhtar, but it's a little bit different here. It's normal, of course, a process of adaptation to a different league.
"Although, I've been to Europe before, now I am in a different country and I have to go through a new process of settling in.
"But today I see myself much better and I hope that my football will be 100% soon.
"I think I had a great performance against Young Boys in the Champions League.
"We had the opportunity to score a few times before we scored the goal at the end, but I was very happy to have returned to the field and I hope to continue playing more.
"I remain focused on my work at Manchester United.
"And I hope to be back in the squad soon for my country to be able to be in the Copa America for Brazil."
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