Barton joins Sky Blues

The two clubs agreed an undisclosed fee for the 21-year-old earlier this week before he travelled to the Ricoh Arena to finalise terms.

Barton made his Preston debut in 2010 and went on to make 60 appearances for the Lilywhites, scoring twice.

But the Republic of Ireland Under-21 international spent much of last season on the sidelines following a broken leg.