Newcastle started the match on the front foot and had a flurry of chances to take the lead that went begging. The Magpies had 13 shots in total but failed to find the net again.
Eddie Howe’s side are hoping to reach the final four in the competition for the first time since 1976.
Here are the half-time player ratings from the match...
9. Miguel Almiron - 7
Found space well and attacked early on to pose a threat. Did well to set-up Joelinton for Newcastle’s second goal. | Getty Images
10. Joelinton - 9
Formed a good partnership with Willock down the left once again. Hit the post early in the second half but scored his third of the season (second against Leicester) with a fine left-footed finish. Grafted well to dominate from the left. | Getty Images
11. Callum Wilson - 7
Linked play up well but saw few chances fall his way. Put in a good shift. | Getty Images
12. Alexander Isak - n/a
On for Wilson 77: Made a couple of good runs to keep Leicester on their toes in the closing stages. Photo: Laurence Griffiths