1) He’ll aid the development of Raheem Sterling
Sterling is arguably already Liverpool’s best player, but he’s still only 19-years-old.
With a Champions League campaign to get through, it’s plausible that Sterling could burn himself out if there wasn’t good players able to play in his position when he needs a break.
Lallana can play in Sterling’s favoured no.10 role, or on the right, enabling Rodgers to take Sterling out of the firing line when he sees fit to help the wonderkid rest and maximise his other-worldly potential.