East also comes into the side at Bootham Crescent
Jed Wallace returns to the Pompey side at York this afternoon.
The midfielder is one of two changes from the side that lost to Fleetwood last Saturday.
He replaces Ricky Holmes, who has to be content with a place on the bench.
Danny East comes in for Shaun Cooper – who is suffering with a groin injury – at right-back.
With several defenders unavailable, academy graduate Jack Whatmough is handed a place on the bench.
Pompey: Sullivan; East, N’Gala, Bradley, Painter; Wallace, Ertl (c), Ferry, Barcham; Agyemang, Connolly
Subs: Smith, Whatmough, Butler, Padovani, Holmes, Marquis, Craddock