Briggs and Szmodics miss Ipswich game.
Both picked up knocks against Leyton Orient at the weekend but boss Tony Humes isn't expecting them to be out of action for long.
"Sammie and Matt picked up minor injuries on Saturday and they just need a couple of days away from competitive football," he told the club website.
"Neither of them will be involved against Ipswich but they should be back for the Fulham game."
Sam Walker suffered no ill effects from his first pre-season outing and is expected to extend his playing time against our Suffolk neighbours, but it is still too soon for George Elokobi to get match time.
U's squad: Walker, Parish, Olufemi, Brindley, Vincent-Young, Wynter, Eastman, James, Kent, Lapslie, Gilbey, Edwards, Moncur, Curtis, Massey, Sembie-Ferris, Wright, Holman, Bonne, Porter