United have enjoyed an excellent start to the season - unbeaten in there 15 matches played this season and are still in the Johnstone's Paint trophy, but were disappointed to be defeated by Burton Albion at the Lane in the Capital One Cup.
The form book shows that the Gas Men are struggling in League Two and are looking over there shoulders at the relegation zone but they are four matches unbeaten at home and will no doubt be looking to claim a cup-scalp in this first ever meeting in this competition of the two teams.
But Collins remains wary and said: "It will be tough at Bristol. They will be really up for it so we need to be as well. It is important from our confidence point of view to go there and put in a good performance and try to keep our unbeaten run going.
"Whenever you cross that white line as a professional footballer you want to win and Saturday will be no different."