Article updated 03/01/2014, 22:45
United manager David Moyes reported Young's absence when speaking in the first part of his press conference on Friday afternoon, and later declared Rooney unfit when briefing Saturday's newspapers.
"He [Wayne] has got a groin injury and won’t be available on Sunday," said Moyes, before adding that the striker has "got a chance" of facing Sunderland in Tuesday's Capital One Cup semi-final first leg.
Meanwhile, Young's blow has been attributed to the challenge he received from Tottenham Hotspur goalkeeper Hugo Lloris during the Reds' 2-1 defeat on New Year's Day.
"We’ve got a few injuries and one is [from] the challenge the keeper made on Ashley Young," reported Moyes.
"It's a shoulder injury and we’re not sure exactly how long he’s going to be out yet. We’ve got some other injuries as well that we’ll just need to look at and see how they are over the next few days."
When asked specifically about the fitness of Robin van Persie, Moyes expanded: "Robin’s coming on but we’ll let you know when he’s ready."