The Portuguese will definitely miss Wednesday's clash with Sevilla and is unlikely to feature next weekend against Celta Vigo, but could make his return for the Blanco's final Liga match of the season against Villarreal.
"We do not know when he will be back with the group, or if he will be back for Villarreal, but it would be perfect to have everyone ready for that final La Liga game," he said.
Any hopes he had of catching Lionel Messi in the race for the Pichichi award, though, have been ended, with the 33-year-old eight strikes behind the Argentine in the race for the top scorer prize.