United are expected to qualify for the knockout stages of the competition after being drawn alongside Braga, Galatasaray and CFR Cluj in Group H.
"We have the experience of playing against Galatasaray in the past and we will always remember the 'Welcome to Hell' banners," Ferguson told ManUtd.com.
"So it's always a difficult type of match.
"Braga are one of the improving teams in that country.
"Obviously, we've never played Cluj before but, after the experience of last year, we don't want to make any stupid errors this time. We will play our strongest team to make sure we get through."