Akon has been hit with a lawsuit from a concert worker who alleges he was left physically disabled after the R&B singer jumped on him during a gig.

Matthew Graham claims he sustained permanent injuries after Akon "negligently or wantonly leapt into the overcrowded mass of concert goers" while performing at the BayFest music festival in Mobile, Alabama, in 2009.

In his lawsuit, Graham claims he severely hurt his knee, back and head during the incident, reports tmz.com. He is suing the Lonely hit maker and the organisers BayFest, Inc. for medical expenses, lost wages, physical pain and mental anguish.