The midfielder is away on international duty with Northern Ireland as he prepares for the European Championship qualifier in Serbia.
His absence is likely to mean a recall for James Wesolowski in the centre as Posh look to bounce back from their 1-0 defeat at MK Dons on Monday night.
Midfielder Lee Frecklington has had a hernia operation and will be sidelined for at least a month, while recent signing Paul Taylor will not feature as he is not match fit.
Striker Dave Hibbert is absent as he steps up his comeback from a dislocated knee suffered back in November.
Source: PA
Source: PA