wrapper classes and dependency injection

As everybody knows, the point of wrapper classes is encapsulates the functionality of another class or component . Here is a simple Class that wrap a small part of PHP Predis library :

class CacheWrapper {

private  $client;

public function __construct(){

  $this->client = new Predis\Client();

}

public function set($key, $value){

   $this->client->set($key, $value);

 }

 public function get($key){

  return $this->client->get($key);

}

 }

and here is the simple code that use this wrapper class :

$client = new CacheWrapper();
echo $client->get('key1');

Where this class would work perfectly the problem that it create the dependency inside the class which i want to avoid by injecting the dependency into the class instead of letting the class to create its dependency , and so the wrapper class will look like this :

    class CacheWrapper {

private  $client;

public function __construct(Predis\Client $predisObj){

  $this->client = $predisObj;

}

public function set($key, $value){

   $this->client->set($key, $value);

 }

 public function get($key){

  return $this->client->get($key);

}

 }

so i have to write the following code to use the wrapper class :

    $predis = new Predis\Client();
    $client = new CacheWrapper($predis);
    echo $client->get('key1');

But i think like that there is no point to use the wrapper class since i still use the original class in my code . so my question is: does dependency injection and wrapper class goes against each other and can't be used together and what is the best way to solve issue like this ?