Rooney missed training on Tuesday after reporting for duty with a tight hamstring and was not named on the bench for Wednesday night’s 4-1 Champions League semi-final win over Schalke.
Evra was introduced as a second-half substitute but took a knock that at one point looked set to warrant Ferguson making another change.
However, the full-back quickly recovered and Ferguson revealed Rooney’s absence was purely precautionary.
“Patrice got a kick,” Ferguson told MUTV. “I was ready to substitute him but he said he was OK.
“Wayne will be all right. I wasn’t prepared to take a risk.”
Having booked a rematch of their 2009 final with Barcelona, Ferguson knows United will be underdogs for the Wembley showdown on May 28.
The prize for both sides is a fourth trophy, which would take them level with both Bayern Munich and Ajax.
And, even though the Catalans boast an all-star side, including Lionel Messi, Xavi and Andres Iniesta, Ferguson does not believe United’s chances should be dismissed.
“Everyone is saying we are playing a fantastic team, which we are,” said Ferguson.
“But you can’t write us off. You can never write Manchester United off.”
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Rooney and Evra fit for key clash