Paul Pogba has called on Manchester United to "wake up" after a third consecutive draw saw them slip behind Chelsea and down to third in the Premier League table.
Draws against Leicester and Burnley either side of Christmas severely undermined United's status as challengers to Manchester City but Saturday's 0-0 at home to Southampton means they are even further off the pace.
Everton await on New Year's Day and Pogba has demanded better from his side, despite the short turnaround.
"We didn't lose but we have to wake up, bounce back and get back to winning," he told MUTV. "We drew again. Three draws we have to win, something has to change and we have to change to win.
"It's only one day and then we have to play against Everton -- that's football. Tomorrow's another day and we have to go out there and win."
On the mid-match injury to 14-goal top-scorer Romelu Lukaku, Pogba said: "When we have Romelu, he makes it difficult for defenders and creates so much space as well. He's a big miss for us but we have the team to fill the gap of Romelu."
Medical staff took every precaution in treating a potentially concerning head injury, placing the Belgian on a stretcher and fitting an oxygen mask.
By full-time Mourinho was confident the worst-case scenarios had been ruled out and was instead predicting a two-match lay-off for the forward.
As for Young, who has been one of United's most consistent performers this term, the possibility of a three-match ban lingers.
That is the tariff handed to Burnley defender James Tarkowski earlier this month after he admitted a charge of violent conduct for elbowing Brighton striker Glenn Murray.