While the squad flew off to Moscow, the striker was left behind at United's Carrington training headquarters in a desperate bid to make the Anfield showdown.
The Liverpudlian dad-to-be, who'll be 24 on Saturday, is keen to play in front of the Kop but is struggling after suffering a calf injury playing for England in the Ukraine 10 days ago.
"We are fighting to get Rooney ready. It may be an uphill fight, but we are trying," said Sir Alex Ferguson in Russia.
The United manager also left Ryan Giggs (virus), Darren Fletcher (groin) and Patrice Evra (heel) behind in Manchester whilst the Reds geared up to take on CSKA Moscow in their Champions League game.
He is hopeful that the trio will make the Liverpool match.
"Evra will be fit for Sunday. He's just had a little problem with heel that we could have risked," Fergie said.
"That was a difficult one, as regards Patrice. Flying for three and a half hours players can sometimes have a reaction. But we are well covered and he is the one that I can say will certainly be fit on Sunday.
"It's difficult to say with Giggs, and Fletcher is a slight doubt, but we are hoping we get the main players fit because it's a big game."
Ji-Sung Park, who is out with a knee injury and wasn't considered for the CSKA trip, is still two weeks away from a return to action.
CRISTIANO Ronaldo's ankle injury has ruled him out of Real Madrid's match against AC Milan leaving Brazilian star Kaka to lead the attack against his former club.
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Drago 34 (21/10/2009 at 09:53)
Secondly does anyone really believe Rooney, Giggs, Evra, Fletcher wont be fit for Sunday? How many times over the years has Fergie played these mind games before a big game?I think all 4 will be fit and start on Sunday.I hope.
Liverpool could well have real problems with Gerrard for Sunday as he came off after 25 mins last night with a groin injury.Its a reacurance of the injury he picked up for England so that is normally 2-3 weeks minimum before he'll be 100% fit and if he risks him he could end up being out for 2-3 months.Johnson is another seriuos doubt but i think Torres will be fit.Just want 3 points Sunday to almost end there season and i dont care how we play as long as we win.