One Direction star Louis Tomlinson is battling a sore knee ahead of the boyband's gig in Northern Ireland on Monday night (11Mar13).

The pop hunk took to his blog hours before the show in Belfast to warn fans he would have to sit out some of the group's more energetic dance routines due to a leg injury, although he failed to elaborate on the cause of the pain.

He writes, "Knee hurts... Ah well f**k it . I apologise if I'm not jumping around on stage as much , stupid knee ! #kneedtogetbetter ( terrible joke)".