Singer and songwriter John Mayer has canceled the final week of concerts for his European tour due to an illness, according to a statement posted on his website.

The announcement came after Mayer was reportedly struck by a stomach illness in Copenhagen, Denmark and canceled his second show in the city. He was expected to perform in two sold-out shows in Amsterdam, a festival in Madrid and a show in Manchester, England for the remainder of the week. Refunds are being issued for these concerts.

The statement on his website assured the singer’s recovery, "Mayer is returning home to the States and a full recovery is expected under a doctor’s supervision." Mayer is scheduled to begin his U.S. tour on July 16 in Charlotte, N.C. –Natthakan Garunrangseewong