Modify pagination result with PHP function in CakePhp

I am currently using CakePHP's pagination function but I need to call a php function before showing the result.

    this->paginate = array(
      'conditions' => $conditions,
      'limit'      => 10,
      'fields'     => $fields,
      'joins'      => $joins,
      'group'      => $group,
      'passit'     => $this->passedArgs
    );

    $result  = $this->paginate('ModelName'); 
    $compare = $this->callGetListToExcludeFunction($sampleParam);

    $finalResult = $this->callCompareResultToExcludeListFunction($result,$compare);
    $this->set(compact('finalResult '));         

The above sample outputs the correct data, but the page count / preview and total is erroneous.

For example, pagination limit is 10 per page, the result view will only show 6 because of the additional php function. Or, the total page would always show higher count.

Is there a way I could call the predefined PHP function before the pagination will add the limit function? This will get the accurate count and total for each search. I cannot add the exclude list in the Model because it is being returned by an API call.

Thank you in advance!