If he's participating in full training that means he's ready to go. We could still be precautions and rest him till the new year, but no way he would have joined the rest of the squad in training full time if he wasn't at 100%.
He's going to get two more full training sessions in before the Deportivo match and I see no reason why we shouldn't bring him on after we've killed the game. It would be a low pressure game being played at a low tempo late on, it would be a perfect time to get him out there for 30 minutes get a couple touches and have a little jog. The Clasico is another matter altogether and I don't think we should be throwing him in there yet, especially at the Bernabeu.