How to mock internal members without initializing class

I want to write unit tests for the following class:

public class Target() {

    private final Member member = new Member();

    public Target() {
    } 

}

I want to initialize this Target class with a mocked instance of Member, as it is not feasible to instantiate Member during testing. Is that possible with any framework?

EDIT:

I do not want to mock Target class. I intend to mock Member class at the time of initialization.

Object method() {
    member.differentMethod();
    //Logic which I want to test
}

Please suggest how to mock this call to the method of Member class.