The German skipper had to leave Chelsea's 1-0 FA Cup final victory over Pompey just before half-time following a reckless challenge from Boateng.
Boateng was shown a yellow card by referee Chris Foy, but Ballack was adamant the Pompey player meant to harm him.
"I am more worried about my injury now," said Ballack, who left Wembley with his right foot in a protective boot.
"I have seen it on TV and to say it was not on purpose means you have to be a friend of Boateng.
"Boateng was lucky to get away with a yellow but it is football and if the referee controls the game and decides it is no red card you have to accept it.
"I can walk on it, not quite comfortable but I can walk, which is not the worst thing. I don't think there is a break.
"We will have to wait until tomorrow to have a scan, then we'll know more. Hopefully it won't stop me playing in the World Cup.
"I couldn't carry on but I hope it's not too bad. Injuries are not good but there is a little time to go yet until the World Cup."