The group are currently mid-way through their 'Progress Live' tour - their first dates with Robbie Williams in 16 years - and the singer admits he has no idea what, if anything, is next for the quintet.
He said: "I don't know. In my head at the moment. I just want to get through this at the moment. If there's stuff we can do, we'll do it.
"If something happens that means there's a reason to carry on we will.
"If we come up with songs we think people will want to hear, we'll do them. If someone comes up with an idea that's about putting money in the bank, then no."
Despite his claims, Mark insists he is looking forward to doing "nothing" when the tour comes to an end.
He added to Time Out magazine: "The mind's a funny thing. I hear it in my head sometimes, 'What are you going to do when this tour finishes? Gary's got 'The X Factor', Robbie's got a solo record, what about you? You're gonna get left behind again?'
"I hear that voice. And I go, 'No, I'm not.' I'm going to enjoy myself, I'm going to take my time. One of the hardest things to do is nothing. That's what I'm going to try and do when this tour ends. Nothing. Achieve nothing."
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