Cooper featured for Hull during their time in the Premier League
Carlisle have re-signed Hull City defender Liam Cooper on a one-month loan deal.
Cooper, 19, made four appearances for the Cumbrians in his first stint with the League One side.
That spell came to an end following a hand injury the Scotland Under-19 international sustained against Huddersfield in February.
Manager Greg Abbott said: "We've seen what Liam can do and we are delighted that he is back with us."
The Cumbrians have an option to extend the loan until the end of the season.