George Boyd, Shaun Batt or Ben Wright could partner Aaron Mclean in his absence.
Posh allowed George Boyd to make the move to Nottingham Forest on Tuesday.
Liam Hatch, Alfie Potter, Rene Howe and Scott Rendell, Shaun Batt, Toumani Diagouraga and George Boyd remain out on loan.
Posh have enjoyed success in their past two matches using a 4-3-3 formation with George Boyd in a free role.
The Posh boss also confirmed that he has still yet to receive an approach for Mclean and Mackail-Smith or winger George Boyd.
Posh are facing an injury crisis with George Boyd and Craig Mackail-Smith both severe doubts and Exodus Geohaghon and Gabby Zakuani already ruled out.
But the Posh's pre-match preparations were not helped by the loss of strike trio Aaron McLean, George Boyd and Craig Mackail-Smith to a virus.
Posh started the game with Aaron Mclean and Ben Wright leading the line, but introduced George Boyd and Shaun Batt as the match wore on.
The midfielder was shown a first yellow for kicking the ball away and then received his marching orders for a second-half foul on George Boyd.
George Boyd equalised shortly after the restart with a precise shot into the bottom corner but Kitson almost immediately headed Middlesbrough back in front after a brilliant cross from Adam Johnson.
For nine years he was married to Patti Boyd, previously the wife of former Beatle George Harrison and the subject of Layla.
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Boyd withdrew from the Scotland set-up under previous manager George Burley because of his lack of first-team action.
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