The games will be behind closed doors but the two clubs are working on a streaming service to allow fans to watch the matches.
The matches will take place just one day before a Posh XI travel to face Gaby Zakuani’s Spalding.
Posh were victorious twice against the beaten play-off semi-finalists last season, once in the league and once in the FA Cup, and drew their third meeting, at the Kassam Stadium in March, 0-0.
Posh’s pre-season schedule now looks like this:
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Bedford (July 10), Gillingham (July 20),Oxford x2 (July 28) Spalding (July 28) Portsmouth (July 31), Swindon (July 31) and King’s Lynn (August 3).