MyController extends Zend_Controller_Action {
  // private vars
  [...]

  public function __constructor($authenticationService, $userRepository) {
    $this->_authServ = $authenticationService;
    $this->_userRepo = $userRepository;
  }

}

For(authenticationService).Use(WhatEverClass);

$currentController->authServ = $authenticationService;
$currentController->userRepo = $userRepository;