Willie Nelson, who was scheduled to play at Reading’s Santander Arena with fellow country idon Merle Haggard on saturday has canceled the show because of illness, the venue just announced.

The nature of the 82-year-old singer’s illness was not disclosed. Nelson’s website, www.willienelson.com, did not have information on the cancellation. He also postoned a show Thursday in Florence, S.C. and a show Friday in Roanoke, Va., but the Sunday in Raleigh, N.C., remained on his schedule.

Nelson and Haggard’s concert that was scheduled for Oct. 16 in Roanoke, Va., has been rescheduled for Oct. 19, and refunds are currently available for their concert scheduled for Oct. 17 in Reading, Pa. The rest of their tour dates are on schedule.

His son, Lukas Nelson, says that the “medical issue” that forced the postponement of tour dates with Merle Haggard is “minor,” and that the elder Nelson is doing just fine.

Nelson and Haggard are to promote to promote their duo disc “Django and Jimmie,” a tribute to a tribute to musicians Django Reinhardt and Jimmie Rodgers.

The disc, released June 2, topped the country chart and hit No. 7 on Billboard’s overall albums chart. It’s Nelson’s first No. 1 album in more than 30 years, since 1983’s “Pancho & Lefty,” also with Haggard.