The group's drummer Harry Judd, who won last year's Strictly Come Dancing, told Digital Spy that the band spent too long out of the public eye before releasing 2010's Above The Noise, which peaked at number 20 on the album charts.
Speaking ahead of band's live show at Wembley Stadium next month, Judd said: "We did an album in 2010, but we had a long gap between album four and five. We'd been going for six or seven years; it took a year and a half to make it, and we didn't do any publicity during that time.
"I think we realised how hard it was to get people interested again. I think we'd taken our success for granted. Thankfully the album went well and we had a big hit with 'Shine A Light', which meant we could go on tour again."
He added: "At the same time though, other bands were coming through and it's hard to stay relevant."
Asked if the group, who have been together for nine years, have considered splitting up, he insisted: "No definitely not, unless there's something they're not telling me! I think we have something unique in the four of us.
"We're still going strong and we're still great mates. We hope we can still have success that allows us to release music and tour."
Judd recently admitted that it felt "strange" leaving Strictly Come Dancing.
McFly will be performing at the Aviva Premiership Rugby clash between Saracens and Harlequins at Wembley on Saturday, March 31. Tickets are available at www.saracensatwembley.com
Watch McFly's 'Shine A Light' music video below: