Swindon will be without injured centre-back Aden Flint as they look to book a place at Wembley with victory over Barnet.
Flint, who has impressed at the heart of the Robins' defence this season, has a groin problem which will keep him out of action for the rest of the season.
On-loan defender Daniel Boateng and new midfield signing Lee Cox are both in line for home debuts after arriving from Arsenal and Inverness in recent weeks.
However, Billy Bodin will miss out as he is cup-tied after playing in the competition for Torquay while on loan at Plainmoor earlier this season.
Winger Luke Rooney is also ruled out for the Robins, who drew 1-1 with Barnet in the first leg, as he is ineligible after turning out for former club Gillingham in the earlier rounds of the competition.
Meanwhile, Barnet could add Andy Yiadom and Jordan Mustoe to their squad.
Winger Yiadom joined the Bees from Braintree on deadline day and full-back Mustoe arrived on loan from Wigan, and both are eligible for the second leg at the County Ground.
Defender Jack Saville will also be available after he rejoined from Southampton last week.
Boss Lawrie Sanchez is still without defender Danny Senda and striker Steve Kabba, who both have knee injuries, while winger Mark Marshall remains suspended after testing positive for a banned substance.
But Sanchez has no new injury worries and could stick with the side which secured a fourth straight league win at home to Crewe last week.
