It was reported over the weekend that Lee needed to have emergency surgery over fears that he could lose his voice.
The 'Breathe Easy' singer was said to be "devastated" because he and his bandmates - Simon Webbe, Duncan James and Antony Costa - were due to tour in just two months time.
Now a statement issued by Blue's Paul DH Baylay, has said: "Further to reports on Lee's vocal issues, Lee will require surgery, which has been scheduled within the next ten days, to remove a cyst that is growing on his vocal chords and thus restricting his ability to sing. After he has had surgery Lee will work with a vocal coach to bring his voice back to full strength.
"The process can be a slow one but we expect to have him back on stage with Blue in October. It needs to be stressed that recovery times for this type of operation vary from person to person."
As a result of the expected recovery time, the tour has been postponed to a later date: "At this point in time I have decided to postpone Blue's European tour scheduled to start in early October to a later date yet to be announced. This will allow Lee's voice ample opportunity to recover at a natural pace without undue stress.
"Lee is extremely humbled by the messages of support that he has received and extends his thanks for all the good wishes. The need for surgery and his deteriorating voice of late has not been easy for Lee but he is looking forward to the recovery and being back on stage with Blue as they look forward to 'Fifteen Years of Blue' in 2016."
For exclusive competitions and amazing prizes visit Reveal's Facebook page NOW.