Mourinho has won three league titles in two separate stints with Chelsea - his last coming in 2015.
He said: "He looks emotional to me".
Before entering the tunnel after the game, Mourinho spent an extended moment on the sideline applauding the United fans who stayed through the 90 minutes. After the match, Mourinho did his post-match interview and had some strong words to the media.
Despite the result, Mourinho said "by strategy we didn't lose, tactically we didn't lose, but we lost the game".
Harry Kane's header and two goals from Lucas Moura at Old Trafford maintained Tottenham's 100% start to the season and lifted them to second in the table. The champions, the brand of football they're playing and that will hurt Man United supporters.
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At the time North Korea issued a sour media statement about its talks with Pompeo on the heels of his two-day visit to Pyongyang. The conflict stopped with the signing of an armistice rather than a peace treaty, meaning the war is not technically over.
In his managerial career, Mourinho has won three Premier League titles at the helm of Chelsea FC, winning two (2004-05, 2005-06) during his first spell with the club, and another (2014-15) during his second tenure at Stamford Bridge.
United's latest setback came on the heels of last week's 3-2 defeat against tiny Brighton.
Mourinho opted for a three-man defence with the recalled English pair of Chris Smalling and Phil Jones surprisingly joined by Spanish midfielder Ander Herrera.
In the first half, zero corners, zero lateral free-kicks, zero frontal free-kicks.
Moura wrapped up the victory, waltzing past Chris Smalling easily before confidently drilling the ball past David De Gea.
For Pochettino, though, this was a statement of intent at a venue where Spurs had lost 21 of their previous 26 games.
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"We worked very well during the week", he told reporters. It is hard to beat Manchester United at Old Trafford.
Spurs came to life as the first half wore on, but the final move was missing for the visitors as Christian Eriksen forced a De Gea save before just missing out on a cheeky pass into the area from Alli.
"It is only the start of the season and we need to be consistent".
"We wanted to put a statement out there".
"Anyone who watched this game can see for sure that the team is united, they can't play like that with such commitment if they aren't united".
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USA and Chinese officials were set to resume talks on Wednesday, but Trump said he expected there will be no real progress. Refinery utilization rates remained unchanged last week at 98.1 percent of total capacity, the highest rates since 1999.