The Portuguese boss was left furious over the summer when he failed to land any of his central defensive targets.
He has drawn up plans to bolster his back four in the New Year but is growing concerned the club are doing little match his ambitions, according to the Telegraph.
It could be another sign that the likes of chief-executive Ed Woodward and Co are still determining whether Mourinho has a future at Old Trafford.
His side are eight points adrift of the top four and their frailties were exposed yet again against Valencia as they crashed to a 2-1 defeat on Wednesday.
Club captain Antonio Valencia is also believed to be looking for a way out with his relationship with Mourinho hitting rock-bottom.
Mourinho is looking towards Napoli's Kalidou Koulibaly and Tottenham's Toby Alderweireld in January.
He is willing to flog Marcos Rojo, Eric Bailly and Phil Jones to get any deals over the line.
But he is frustrated that little work is going on behind the scenes and fears he will be stuck with his faltering defence until the end of the season.
United face Liverpool on Sunday but could have a threadbare squad to choose from with nine players injured.
Alexis Sanchez and Victor Lindelof are definitely out of Anfield with respective hamstring and thigh issues.
But defenders Luke Shaw, Chris Smalling, Diogo Dalot and Matteo Darmian, as well as Anthony Martial all did not travel to Spain and are doubts for the weekend.
Scott McTominay was in Valencia but did not end up making the squad because of an injury, while Marcos Rojo had to come off at half-time in the 2-1 defeat at the Mestalla Stadium.
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