According from what I've heard, Kromkamp is not leaving Anfield despite what many reports claim. He was heavily linked with Ajax, however they've just signed a right-back. I don't see why they would go after Kromkamp after this signing.
The fact that we're interested in Daniel Alves has fueled the speculation however imo I think that if we do sign Alves it will be for the right-flank. He's been critisized by Van Basten for leaving Holland, but he's only 25 years old. Finnan is going to turn 30 so it's not impossible for him to break in the team in the near future.
Of course we have Barragan in the reserves who has done very well this season. But he's still a young lad and seeing how Benitez likes to rotate and rest players, having Kromkamp around won't hurt us.