"I am sure many managers up and down the country will be outraged at this new rule," the Posh manager told the clubs official website.
"I can understand this being enforced at international level because people pay large amounts of money to watch the matches and don't want to see 40 different players involved, but to introduce this rule for pre-season friendlies is madness."
Posh kick-off their pre-season schedule with a agme against Ipswich Town this weekend.