Well, he is a massive gash TBF.
The Portugal winger was not expected to be back until after the international break.
He suffered a gashed leg following a challenge by Jamie Carragher in the defeat by Liverpool last week.
Ferguson said following United's training session on Monday: "There's a good chance (Nani) will be involved. He and Michael Carrick trained on Sunday. Both will be involved tomorrow."
Carrick and Michael Owen were also in attendance at Monday morning's training session, following calf and knee injuries, with United tomorrow looking to build on a 0-0 first-leg draw against the French champions.
There was also a surprise appearance by Hargreaves, whose career has been blighted by injury.
He trained away from the main group, as did Park Ji-sung, who has had a hamstring injury.
However, there was no sign of Rio Ferdinand, who has a calf problem, or Darren Fletcher, who has been suffering from a virus.
Anderson, Jonny Evans, Anders Lindegaard and Nemanja Vidic were also absentees from the training ground
United's manager told his pre-match press conference on Monday of Nani: "Good chance, he'll be involved.