Winger Nani's speedier than expected recovery from a leg injury and the availability of Michael Carrick and Antonio Valencia has come just in time for Tuesday's Champions League last-16 second leg against Olympique Marseille at Old Trafford.
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Portuguese Nani trained with the first team on Monday and will play a part in the game despite Ferguson previously ruling him out after he sustained a gash in a tackle by Liverpool's Jamie Carragher just over a week ago.
"He trained on Sunday also, he and Michael Carrick, which is a better situation than I had at the weekend," Ferguson told a news conference, referring to Saturday's FA Cup win over Arsenal where midfield injuries forced him to field seven defenders.
"Both will be involved tomorrow."
"It was a fantastic bonus for us to get 45 minutes from Antonio on Saturday," said Ferguson. "The question is whether we can play him from the start or continue as we did on Saturday as a substitute.
"It's a great selection problem for me."
Ferguson said his team's pursuit of three trophies - the Premier League, FA Cup and Champions League - would be boosted by others also close to returning, such as midfielder Park Ji-sung who could be fit for Saturday's game against Bolton Wanderers.
"Hargreaves started training this morning. Hopefully, you never know, we may have him available towards the end of the season," said Ferguson.
"It doesn't matter how many players have been injured in the past, the important thing is to have them all available for the run-in. Hopefully if we can do that it will definitely increase our chances."
