With the likes of Michael Carrick and Louis Saha available after injury, The Red Devils manager had five internationals at his disposal for the 2-2 draw at Emirates Stadium.
"We have people fit again," said Ferguson. "I can now alternate our side at times.
"It was the strongest bench I have had this season and that is encouraging for us.
"The lads have done a fantastic job to get us into this position and we can change things now when we need to."
Although it was a good weekend for Chelsea in the title race, Ferguson is predicting more drama to come in the quest for the Premier League crown.