And Lucas would put the match away five minutes from full-time, using his speed to open up the United back-line before avoiding Chris Smalling and firing an unstoppable shot past De Gea.
United never recovered from Lukaku's missed chance when he dribbled round Hugo Lloris following Danny Rose's wayward backpass and a flurry of second-half goals from Spurs heaped yet more misery on Jose Mourinho. "Three for me and two for them", he said.
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.
Football has moved on, coaching has moved on and too often now does he look like a coach who has allowed the game to pass him by.
It looks like come January, Mourinho will be looking for new players.
The Daily Mail were among those to lead on the taunts from Spurs fans towards Jose of "You're getting sacked in the morning", while the Express picked up on Mourinho's refusal to discuss United's lack of summer activity in the transfer window.
Mourinho has won three league titles in two separate stints with Chelsea - his last coming in 2015. "Keep trying. We lost last season here against Sevilla and were booed because we deserved it, because we were not good", he said.
In the aftermath of Manchester United's loss to Tottenham, Craig Burley says it's time for Jose Mourinho, Ed Woodward or both to leave Old Trafford. And, it appears as if Mourinho knows this team needs some better players, but who knows if that will even fix this.
"Pogba is a very good player, but a Manchester United player right now, and we'll see if something happens in the future".
Mourinho knows the answer to that question well enough. A team playing with confidence, Manchester United isn't. He needs to find a way to get himself and his team out of their downward spiral, but talking about the past isn't the way do it.