The opening dates of Whitney Houston's first U.K. tour in 11 years have been postponed due to illness.

The first three dates of the tour at Manchester Evening News Arena (April 8-9) and Glasgow SECC (April 11) have been rescheduled by promoter Marshall Arts. The Glasgow date has been moved to May 1 and the Manchester shows will take place at the end of the tour on June 16-17.

The decision was made with "great disappointment" according to a statement. It follows the April 6 announcement that Houston's Paris show that evening was postponed.

"Doctors visited Whitney late last night in Paris and confirmed that she was suffering from an upper respiratory infection," said the statement from Sony Music today (April 7). "Upon medical advice Whitney has been advised that she cannot perform to allow her time to recover."

Houston's performance during her "Nothing but Love" world tour in Australia in February was panned by some critics and fans. Her publicist Kristen Foster issued a statement at the time denying Houston was having health problems and insisted she was having a "terrific time on her tour and with her fans."

The show features production from Baz Halpin, who created shows for Pink and Tina Turner.