With Shane Carwin recently withdrawing from his co-main event fight with Roy Nelson at UFC 125 on New Years Day due to a back injury the UFC have made the decision to abandon efforts to find a suitable replacement.

Instead TUF 10 winner Nelson has now been pulled from the card altogether with a featherweight title fight between Jose Aldo and Josh Grispi now taking on co-main event status as the first big fight to emerge from the UFC and WEC’s merger.

Though Nelson was keen to fight at the event it may prove to be the best for him in the long run since he is just months removed from knee surgery and on his twitter account recently he had hinted that ideally he could use a little extra time to get back to 100%.

Meanwhile Carwin will undergo back surgery on Tuesday.  At this stage it’s unclear exactly when he will be fit to get back into the octagon, but if all goes well the former No.1 contender is aiming for March.