mockito: Is there a way of capturing the return value of stubbed method?

If I mock a method to return a new instance of some object, how can I capture the returned instance?

E.g.:

 when(mock.someMethod(anyString())).thenAnswer(new Answer() {
     Object answer(InvocationOnMock invocation) {
         Object[] args = invocation.getArguments();
         Object mock = invocation.getMock();
         return new Foo(args[0])
     }
 });

Obviously, I can have a field of type Foo and inside answer set it to the new instance, but is there a nicer way? Something like ArgumentCaptor?