The legendary 'Back in Black' rockers - Malcolm and Angus Young, Phil Rudd, Cliff Williams and Brian Johnson - had been working on the follow up to 2008's 'Black Ice' but forced to cancel sessions when one of them was taken ill.
Choosing not to reveal which of the band it is, Brian told US radio progamme The Cowhead Show: ''Hopefully this year we can get back together again.
''One of the boys is a little sick. I can't say anything, but he's getting better.''
When asked if the illness was serious or terminal, he reassuringly added: ''No, but just bad. He's doing wonderful. A full recovery is fully expected.''
The singer also said the group are set to meet up to discuss ''how we're feeling'' about their 40th anniversary celebrations in 2013, and whether they will tour.
The band completed a two year tour in support of 'Back Ice' in 2010.
The group have previously said they don't work to deadlines when making their albums, as they don't like like the pressure of working to them.
Brian said: ''Nobody says, 'Right, let's get in the studio by January.' That's because immediately we have an enemy - time. And that makes you worried and that makes you in a box and you have to think.''