United are currently in negotiations to sign Barcelona midfielder Thiago and have offered him a £6.2 million-per-year contract.
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"I know with the Manchester United fans, they are used to having a really dominant central midfield player," he told the club’s official website.
"But I think what the fans have got to look at is: Is the balance of the squad pretty good anyway without having that type of player in? You've got to say 'yes' as we won the title by 11 points.
"Now, of course you always want to improve but you've got to look at the balance of Antonio Valencia, Ashley Young, Tom Cleverley, Michael Carrick, Ando [Anderson] and the rest.
"They are still very, very good players but you've got to look at the balance and is that right, rather than go out and try to get an individual who you must rely on all the time."