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Former Manchester United captain Bryan Robson believes Bruno Martins Indi would have been an ideal signing for the club.
The 22-year-old Holland centre-back joined Porto from Feyenoord on Wednesday after enjoying a successful World Cup under new United boss, Louis van Gaal.
And their former captain is concerned the Red Devils may have missed a trick in not signing the Dutchman, with the club in need of a 'top-drawer' centre back.
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"He really impressed me in Brazil, especially against Argentina when they were up against it," Robson told Press Associaiton Sport.
"He had a really good tournament. He had a big presence on the pitch and we need someone like that."
Last season United conceded 43 goals. After losing Vidic, Rio Ferdinand and possibly Patrice Evra, Robson is concerned United lack experience in their back line.
"When you lose three class defenders like that you need to bring in a really top-drawer centre-half to the club. That would really give us a chance of winning the title," Robson continued.
"You look back over the years and United have had Nemanja and Rio as a pairing, Brucey (Steve Bruce) and Pally (Gary Pallister).
"Then we had Jaap Stam. He was a really dominant and aggressive player and we need one of those to come in to the club."
