The Spurs boss continued: "From the intensity level and freshness, they were much stronger than us".
"I am not speaking just about Harry Kane, I am speaking about Giovani Lo Celso, Erik Lamela - in this moment they could give us the balance".
City suffered heatbreak at the hands of the Lilywhites, who escaped with a 2-1 victory thanks to Son Heung-min's victor after a Teemu Pukki penalty cancelled out Dele Alli's opener. "Yes, I think so", Mourinho explained.
"We've a very small group of players with so many problems we're having, and everyone is giving absolutely everything". It was in the limits for me with players available and not available.
A clip of Mourinho running to confront the fourth official after a video assistant referee (VAR) decision in Spurs' 2-0 win over Manchester City on Sunday has gone viral on social media, and the Portuguese said emotion got the best of him. The referee... can make mistakes and I have full respect for them because it is very, very hard.
Lucas Moura made it 2-2 against Southampton on Wednesday
"They were the best team, but I can not forget all the other circumstances, and my players, they were phenomenal".
Son has now scored in four consecutive matches across all competitions and is really beginning to help fill the void of injured striker Harry Kane.
"One game we have players A, B and C out and then the next game we are without D, E and F. It's been a very hard season".
Mourinho believes the 54th minute was the turning point, when he substituted Jan Vertonghen and introduced Dele Alli as Spurs changed from a back three to a back four.
There will be no replay as they have now been scrapped for the fifth round, meaning that, if the score is tied at the end of the 90 minutes, the game will progress to extra-time and, possibly, a penalty shootout to decide who will progress to the last eight.
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