Tony Adams side must take on Bristol Rovers at the Memorial Stadium, a few days after the teams meet at Wycombe in the league.
Adam Birchall's early strike for Wycombe was enough to beat Swansea City on home turf this week. Rovers who were also at home in the second round, took on Conference leaders, Barnet. The League Two side went ahead thanks to a well executed Jamie Forrester free kick, before Lee Thorpe rounded up proceedings after the break.
Other ties: Swindon Town v Bristol City; Northampton Town v Southend United; Leyton Orient v Walsall