Rafael Nadal still has no timetable for his return from a knee injury. The Spaniard, who hasn’t played since losing in the second round of Wimbledon in June to little-known Lukas Rosol, is recovering from a partially torn patella tendon in his left knee. In interviews with European newspapers on Tuesday, the 11-time Grand Slam champion said he’s not sure how soon he’ll be back or whether he’ll play in the Australian Open in January. “All that is in my mind is to keep working hard to come back,” Nadal said. “I cannot think about the future because it’s not like if you break your arm and you know you will have a few weeks like this, then a few weeks like that and then you are back. “This is a day-by-day thing. I have checks every day to see how I’m improving. I can’t predict what will happen.” Nadal could miss the ATP World Tour Finals in London Nov.5-12 and Spain’s Davis Cup final against the Czech Republic on Nov.16-18.