The prison officers' union told AFP one of the guards had been held hostage for nearly four hours at Full Sutton prison near York in northern England on Sunday, until riot officers managed to free him.
Officials did not confirm reports that the three attackers were Muslim prisoners inspired by the murder last week of a British soldier who was hacked to death in a London street by suspected Islamic extremists.
"An officer was taken hostage at Full Sutton prison on Sunday evening," a spokesman for the prison officers' union, the POA, told AFP.
"A team of riot officers was deployed and managed to diffuse the situation after four hours.
"I understand that the injuries sustained by the two officers involved in this incident were minor and they have now been discharged from hospital -- but we are lucky that this situation didn't turn out to be as life-threatening as it could have been."
The justice ministry confirmed that "an incident involving three prisoners" had taken place at the jail.
"A police investigation is ongoing," a ministry spokeswoman said.
The Sun said the officer had been stabbed during the attack and that the second injured guard was a female officer who was hurt trying to stop him being dragged away.
Ten people have been arrested over Rigby's murder. The two prime suspects, both Muslim converts from Nigerian Christian families, remain in separate hospitals under armed guard after they were shot by police at the murder scene.
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