Caroll was on loan at Preston for a five month period, with an option to take him for a further spell.
But his time at Deepdale has been troubled, to say the least. He started less than half a dozen games, was sent off against Scunthorpe, whilst also being reprimanded on England duty.
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Allardyce called him back to St James' Park for a dressing down after being sent home in disgrace from the England Youth squad, and the Preston "experience" is now over.
But he could move out on loan again, with two Scottish clubs Motherwell and Gretna supposedly interested.
But he could move out on loan again, with two Scottish clubs Motherwell and Gretna supposedly interested.