Mark Wahlberg is in training to film The Fighter 2. 'Before I made the first one I knew that the second one was in the pipeline,' Wahlberg told NBC's PopcornBiz this week.

'I’d like to do it sooner rather than later, because I’m already training,' he added. 'I already sustained another injury. I shattered my knuckle. We’re still training every day.'

Read More:

'The Fighter's' 'Irish' Micky Ward - a working class hero - SEE VIDEO

Mark Wahlberg confirms sequel for Oscar-winning ‘The Fighter’ - VIDEO

'The Fighter' star Amy Adams to star in controversial Scientology film

Although officially he hasn't cast Christian Bale, Melissa Leo, Amy Adams or director David O. Russell in their trademark roles, Wahlberg is not concerned.

'We’ve talked about it,' he confessed. 'They have to. It’s non-negotiable.'