Angel di Maria and Louis van Gaal
Angel Di Maria has joined United for a British recordGetty Images/STEVE PARKIN

Manchester United have been criticised for splashing £60m on signing Angel di Maria from Real Madrid instead of reinforcing other areas of their flailing squad.

Di Maria could make his United debut against Burnley on Saturday 30 August after completing his move to Old Trafford for a British record to become the club's fourth signing of the summer.

However, the obvious gaps in the United defence and midfield, which are yet to be addressed, have frustrated former player Ray Wilkins, who says Germany's World Cup winning duo Mats Hummels and Sami Khedira should have been signed instead of Di Maria.

"They are putting the roof on before the foundations of the house," Wilkins told talkSPORT. "I think they spent the £60million unwisely on Di Maria.

"Why don't they go and pay £35million for Mats Hummels first? We know Dortmund, as good a side as they are, are a selling club. They sold Lewandowski, they sold Gotze.

"They are a selling club, so take him [Hummels] out of Dortmund and put him in alongside Phil Jones and Khedira and there's your £60m and you already look more solid."

United have signed Luke Shaw, Ander Herrera, Marcos Rojo and Di Maria this summer but a failure to land other targets, plus a host of early season injury problems, has meant manager Louis van Gaal has begun his tenure at the club in uncertain fashion.

A failure to win any of the club's first three games of the season as seen the pressure ratchet up on the ex-Netherlands coach, who is planning to stage a mass overhaul of his United squad before the end of the transfer window.

"I cannot say anything about that because it raises the price," he said on potential deals before the 1 September deadline.

"Also, players shall go in the meantime. I had a conversation after lunch with the players and I said, maybe after this weekend, we shall have another group because players shall go away and others shall come in.

"I have given them every chance and now I have judged all the players and after that I can take my message.

"We know already what players we want and sometimes you can have them but sometimes no, it is also dependable on the [selling] club."