George Byers starts for Pompey in their League One clash with Bristol Rovers at Fratton Park this afternoon.
He replaces Charlie Daniels in the only change from the side that were beaten at Swindon earlier in the week.
It is not clear who will move to left-back or whether Danny Cowley has opted for a switch from his usual 4-2-3-1 system.
John Marquis leads the line for the Blues and makes his 100th appearance for the club, while former Rovers players Lee Brown and Ellis Harrison miss out through injury.
Pompey: MacGillivray, Johnson, Naylor (c), Williams, Close, Marquis, Curtis, Nicolaisen, Byers, Harness, Raggett
Subs: Ward, Bolton, Downing, Daniels, Cannon, White, Stanley