Manchester United ended the transfer window with Daniel James, Aaron Wan-Bissaka and Harry Maguire as their new signings, with fees totalling above the £140 million mark.
The Red Devils also had Romelu Lukaku leave the club on deadline day for in a £73 million deal that saw the Belgian join Inter Milan.
But former United striker Louis Saha believes the club missed a trick with not signing Tottenham's Toby Alderweireld.
Speaking to Bwin, Saha commented on the lack of approach and was left confused.
"Why United didn't trigger Alderweireld's release clause is a complete mystery to me," the ex-striker said.
"He's been excellent for Tottenham and would have instantly strengthened United's defence."
United have been linked with Alderweireld for a few windows now, and when his £25 million release clause became active it was expected they would make a move.
"When you look at the money United have spent on defenders this summer, they could have got themselves an absolute bargain who still has a lot of years of football to play,
"United clearly made Maguire the main target, but the pair could have been a real force together."
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