United suffered the unpleasant start of the season, leaving them a disappointing eighth place in the Premier League.
Last weekend's loss of 3-1 on the derby to the rivals Manchester City reduced the difference in quality between the two sides.
Jose Mourinho started Chris Smalling and Victor Lindelof at the heart of the defense in Etihad but failed to prevent David Silva, Sergio Aguero and Ilkai Gundogan from getting into the record.
Lindelof was one of the signatures of the United Bosses in his second summer at Old Trafford, but it is well known that this year he wanted another new center.
Tottenham's Tobi Alderveireld felt that he was on top of the list he was looking for from Mourinho while he was trying to support the defense of Manchester United.
And the Portuguese was present on Thursday night to see the 29-year-old in action with a January portable window on the horizon.
Mourinho was represented at the stands during the Belgian victory of 2: 0 against Iceland by the Belgian journalist Kristof Terreur.
Michi Batshuaii got in touch and Eden Hazard impressed that the side of Robert Martinez fell to comfortable winners.
But it seems that Mourinho's interest will continue at the other end of the pitch, and Alderveireld has formed a three-point line with Vincent Kompani and Dedrick Boiata.
Alderveireld is not in a contract with Tottenham next summer, but the club has the option of extending the contract for 12 months.
It would have triggered a £ 25m release clause that would fit into its conditions – a hit for the former Ajax player.
Tottenham could seem to find Alderveireld in January, instead of losing him for the summer event.
And Murinho seems to be among the bidders after he went to Belgium and saw a return action.
United are also linked to Inter Milan Milan Skrinyar and Fiorentina's Nikola Milenkovic, as they seem to strengthen in defense.
However, former Chelsea and England striker Chris Sutton asked whether Mourinho needs to trust more funds.
"Mourinho is hacking about money, but is the national team this season acceptable last year?" Sutton said.
"He talked about how much the city spent, but first they have to catch Watford and Bournemouth.
"And when you look at the signing it made, how much did it actually work?
"Did he spend the money well? I do not think so. Why would the United Board believe him to spend well in January?"
United has recorded an interest in the January Playmaker for River Plate Ekekuiel Palacios.