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5 January 2012, 14:01 | Updated: 5 January 2012, 14:03
A spokesperson for the group tells Capitalfm.com that the injury is "nothing serious".
JLS singer Aston Merrygold is to undergo physio on his knee ahead of the group's forthcoming '4th Dimension' tour.
The 'She Makes Me Wanna' star revealed he was battling an injury in a post on Twitter today (5th January).
He said: "Isn't it great when the doctor says you need an x-ray!! :( not the one Axx"
In another post two hours later, Aston added: "Physio for me knee it is then! And with tour round the corner! Dooooh!! Good start 2012!! Lol Axx"
A spokesperson for JLS told Capitalfm.com that the injury was "nothing serious", adding: "Just another bit of ligament damage."
JLS' '4th Dimension' tour kicks off in March and will be the group's first live jaunt since the release of their latest album 'Jukebox' at the end of last year.