Clarke in for Packwood
John Ward has made one enforced change from the side that beat Wimbledon 3-0 last weekend.
Will Packwood is not eligible to play in the FA Cup, so Ollie Clarke comes in in his place, which sees Tom Lockyer move to centre back.
Alefe Santos returns from injury to take a place on the bench.
Team: Steve Mildenhall, Michael Smith, Tom Parkes, Tom Lockyer, Lee Brown, David Clarkson, Ollie Norburn, Eliot Richards, Ollie Clarke, Mitch Harding, Matt Harrold
Substitutes: Ellis Harrison, Conor Gough, Jake Green, Josh Southway, Pat Keary, Jamie Lucas, Alefe Santos
Crawley Town: Paul Jones, Mark Connollym, Kyle McFadzean, Joe Walsh, Mat Sadleer, Nicky Adams, Dannie Bulman, Josh Simpson, Billy Clarke, Emile Sinclair, Gary Alexander
Substitutes: Jonathan Maddison, James Hurst, Sergio Torres, Andy Drury, Jamie Proctor, Jonte Smith.