Manchester United manager Sir Alex Ferguson has told his side to avoid the "stupid errors" that marred last season's UEFA Champions League campaign, following Thursday's draw for the group stage. United have been drawn alongside Braga, Galatasaray and CFR Cluj in Group H, in what appears to be one of the more straight-forward groups in this season's draw. However, United failed to emerge from a group last term that featured Benfica, Basel and Romanian debutants Otelul Galati. Ferguson, whose squad has been bolstered by the arrival of former Arsenal striker Robin van Persie, is particularly concerned by the prospect of playing in the hostile environment they can expect in Istanbul against Galatasaray. "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. "We have drawn Portuguese clubs a number of times over the past few years - the likes of Benfica, Sporting Lisbon and Porto - so we have the experience of playing in Portugal on many occasions. 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." FIFA