"Daniel is training really well and improving. He has a specific programme with weights to strengthen his back. He is doing well and progressing but the main thing for him now is match fitness," said the boss.
"We have to be careful with him and we have been talking with the doctor and the fitness coach Paco [De Miguel].
"We are hoping he could be back playing next week. When and where we still have to decide but we have the match against Fiorentina and also the reserves game on the same night.
"It will be very positive to have Daniel back."