The Girl Crush hitmakers cancelled a string of summer (15) shows on their Pain Killer Tour in North America last month (Jun15) after doctors found a polyp on Westbrook's vocal cords.

The operation was successful, and although Westbrook is on the road to recovery, he has been advised to take a little extra time before returning to the stage.

A statement posted on the group's website reads: "It is with deep regret that we must cancel an additional three weeks of shows in August due to doctors' orders for Jimi to rest and recuperate his voice. We want to come back on the road to you guys at 110 per cent, and this additional time will make sure that happens!

"Thanks again for all of your support during this time, and for your love, patience and excitement for us to come back! We can't wait to see all of you."

Little Big Town had been due to resume their tour in Delaware on 31 July (15), but they will now pick up the trek on 22 August (15), when they play Canada's Eastbound Hoedown Music Festival.