Fred has admitted he endured an “awful” debut season at Manchester United.
United signed the Brazil international from Shakhtar Donetsk for £48million in the summer of 2018, but he struggled to feature on a regular basis with the first-team.
Fred scored one goal in only 17 Premier League appearances that season.
“I believe the first season was very difficult for me,” he told the Associated Press.
“There was the process of settling down here, but also other personal things that were happening in my life, such as the birth of my son.
“So I believe it was a mix of reasons that made me have an awful first season.”