The Italian boss endured his fifth league defeat of the campaign as goals from Marcus Rashford and Ander Herrera threw the title race wide open.
Man U 's win over Chelsea reduced Chelsea's grip at the top of the EPL table to 4 points above Tottenham and Conte fears his boys could now lose the title if they don't show enough enthusiasm.
Speaking to Sky Sports he said:
“We are doing a great job and a miracle if you consider last season. If we are able to win, we must be proud.
''For sure I have concerns because we have to work together and we have to quickly find the right desire and the right ambition to win this title. Tottenham are in good form, are playing very well, show great enthusiasm and we must have the same.
“If someone thinks it’s normal for Chelsea to win this title, I don’t think this season is normal because we started as underdogs after a 10th place finish last season. For this reason I think we must find the right enthusiasm."
Chelsea failed to hit a single shot on target during the 90 minutes and Conte admits it was his fault that his side played so poorly.
"They deserved to win, because they showed more desire than us, more motivation. In this case, the fault is the coach. It is mine. In this case I wasn't able to do the right motivation."