Lyon fullback Rafael has taken aim at the transfer policy of former club Manchester United.
The former United full-back was part of the last team which won the English top-flight under Sir Alex Ferguson during his last season at the club.
"It has taken too long to get back on track," Rafael told ESPN.
"It's been seven years [without a Premier League title]. We did some things wrong. We started signing expensive players and giving them a lot of money. I don't agree with that. Just because a player costs £150 million does not mean he's good for the team. It depends on the character of the player.
"I think that's where we made mistakes, we start to just buy players. I think it has to be a mix. You have to buy some expensive players but not all. I am a supporter too and I know they want the best players but let's see if he's the best player for Manchester United, let's see if he is going to work."
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