Weekend injury rules out full back.
Ben picked up a dead leg injury in the final friendly against Bishop's Stortford on Saturday and has not yet recovered sufficiently to be considered for the match at Huish Park.
The former Bury man aside, however, the U's are set to take a strong side down to the West Country.
All of the senior pros will be hoping to be involved in the First Round clash and young duo Alex Gilbey and Drey Wright have been rewarded for their pre-season displays by being included in the travelling party for the match.
We'll have full match commentary on U's Player later on Tuesday night.
U's: Cousins, Pentney, Aldred, Rose, Okuonghae, Heath, Duguid, O'Toole, Morrison, Izzet, Sears, Bond, Bean, Henderson, Eastman, Wilson, Wordsworth, White, Gilbey, Wright