Nick Grimshaw will not return as a judge on The X Factor this year, and presenter Caroline Flack is also leaving the show, according to a report in The Sun.

A spokesman for Grimshaw, who spent just one season as a judge on the ITV show, told The Sun the Radio One presenter had decided to quit.

The programme is said to be undergoing a shake-up of its judging and presenting talent under the supervision of boss Simon Cowell after it suffered a ratings slump in 2015.

One Direction star Louis Tomlinson is favourite to replace Grimshaw, although Cowell could bring back former judge Louis Walsh, according to the newspaper.