The 39-year-old singer said the band - also comprised of Lee Ryan, Duncan James and Anthony Costa - is working on their first studio album since 2015's "Colours", which underperformed and saw them dropped by record label Sony Music.
However, with Lee in "EastEnders", Duncan in "Hollyoaks" and Anthony's commitment to an Agatha Christie play, the singers have had to save the weekends for working on new tunes, reported Contactmusic.
"We're in the studio. We did the Sunshine Festival in Worcester. We're going to Latvia tomorrow. We're constantly working, at least two or three times a month," Simon said.
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