Rooney, who is currently the manager of DC United, believes De Jong would have been a better fit in Man United manager Erik ten Hag’s squad than Casemiro.
Man United had on Friday announced the signing of Casemiro from Real Madrid.
“This goes back to the need to look to the future,” Rooney said via the Times.
“Ideally, they should be signing players in their early to mid-twenties, and Casemiro is similar to Christian Eriksen — someone who has been a good player, but are they going to help the club move forward? Frenkie de Jong, Ten Hag’s principal midfield target, would be a better fit.
“The Casemiro deal seems to have come from nowhere and looks like a reactive signing — I would be surprised if he was a player identified as a priority to bring in when ten Hag arrived.
“It looks like, having been unable to sign de Jong, United just reacted to Casemiro being available.”