According to his twitter -

Thanks for the messages, pec injury, new injury for me so hopefully know the extent over the next few days...

Hope it's nothing too serious for the pair of them!

Feel sorry for Donaldson. Some fans wrote him off after last year. I still believe the lad will become a star. Before his cruciate injury he was in outstanding form and he just couldn't back to full fitness or a run of games last year. Hopefulyl it's not too much of a setback as the guy has got talent.

Like for like swap with Addy IMO. Shame Olbison is injured though because he looked real good last season.

Think it's a different knew to the one he injured previously. Shame for the lad as he had really kicked on and had recaptured his form from before the knee injury. It's his last year of contract do I hope we see him back and showing us what he can do

Confirmed on twitter by Ross, James is out for 6 months. Cruel luck for the kid, it really is.

Absolutely gutted for him. I think he really needed to kick on this year and he looked in good shape in pre season. Its effectively season over for him when I believe he is OOC at the end of the year.

Shame for him, Gotta be cya later for him though, hasnt shown enough in games hes been fit.

Gutted for James he had started to show his talent after coming back from the first injury. Out of contract this year, will the bulls throw him to the lambs or stick by him since he is home grown and should really be given a new contract

Played against him through all the junior years up here in cumbria. Fantastic player who ripped these youth leagues apart and when he signed for bulls i was expecting big things from him but when you get x2 ACL injuries you carnt help but feel sorry for the guy thats probably his time at bradford over now

gutted for him, I hoped he would be able to crack on this year but he's had another bad injury.

Grim news. Feel for the lad.
We are really cursed with injuries once again.