Sam Warburton remains on course in his recovery from injury but has not been given a comeback date.
The British & Irish Lions captain tore his hamstring in the second Test against Australia in June.
Warburton was given a rehabilitation period of up to 16 weeks from the time of the injury in Melbourne.
That would see the fearsome flanker potentially available for the Blues' Heineken Cup round two clash against Toulon - three week's ahead of Wales' opening autumn international with South Africa.
The 24-year-old is progressing well but remains in the dark over a specific comeback date.
"I'm on schedule. I started jogging last week - just some light stuff to try to load the hamstring and no reaction to that so far," said Warburton.
"They said 16 weeks to star, but the physio has said that until we tick certain boxes he can't give me a return date yet.
"It is 50% jogging at the moment and then I will up it to 60%, 70% and more. Then you have to put in some contact.
"There are a lot of things I have to do, and a lot of boxes to tick, before I get back. I've asked for a return date, but they've told me there is a lot that could happen in the next six weeks or so as I progress in my rehab and get more aggressive with it.
"What's difficult for me is that I haven't been given a target fixture for a comeback. It means I will just have to see how the re-hab goes, which is pretty boring.
"Some players have a bit more difficulty getting back to top speed when they come back from hamstring injuries, while others shave a few weeks off their recovery time.
"The honest answer is 'I don't know when I'll be back'."
And Warburton is well aware that a swift return is imperative with both the Blues and Wales boasting a wealth of talent in the back-row.
At the Arms Park new Wales caps Josh Navidi and Andries Pretorius will be aiming to build on impressive seasons alongside Robin Copeland.
While Wales boast another four Lions back-row forwards in Toby Faletau, Dan Lydiate, Justin Tipuric and Ryan Jones.
"We have got the strongest back row selection in the northern hemisphere," added Warburton.
"It is a nice situation for the coaches to be in, but it makes it harder for me. I just need to get back playing for the Blues as quickly as possible."
Wales kick-off their autumn campaign against the Springboks on November 9, before clashes with Argentina, Tonga and Australia.
Wales Head Coach Rob Howley talks to WRU TV's Sebastian Barrett about the 36-man squad he has just named for the forthcoming Under Armour series, which includes two uncapped players, Ospreys duo Sam Davies and Rory Thornton.
Head coach Rowland Phillips is deligthed he can now call BT Sport Cardiff Arms Park home for his Wales Women's side, who launch their international season next month with games against Scotland and UK Armed Forces in the heart of the capital city.
Wales Sevens star Sam Cross has put his home town club of Brynmawr on the map after winning a silver medal at the Rio Olympics with Team GB. His club have now honoured him by naming their players bar after him, as WRU TV discovered at the official launch, recently.
One of the newest members of the Principality Premiership, Bargoed admit it's proving to be a steep learning curve at the highest level, but are determined to become a force to be reckoned with. WRU TV visited the club last weekend when they took on Llanelli.
Table-topping Aberavon travel to north Wales to tackle RGC 1404 as both teams defend unbeaten starts to the season in the Principality Premiership. WRU TV's Graeme Gillespie visited the Wizards to see how their preparations were going for the game of the weekend.
The Half a Game initiative is currently sweeping across Wales and proving a major success. The scheme aims to give every young player at least half a game every weekend. WRU TV recently visited a festival in Narberth where clubs have fully embraced the initiative.
Both Bargoed and Swansea were seeking their first win of the Principality Premiership season this afternoon. It proved a fruitful day for the hosts - not only did they win, but Bargoed claimed a try bonus point.
Cardiff managed to keep their unbeaten record at home intact, but only just as Bridgend made them work extremely hard before the Blue and Blacks secured a hard fought Principality Premiership win at the BT Sport Arms Park last night.
Former Wales back row Andy Powell gives a guided tour of The Wern, home of Merthyr RFC, who are determined to prove a lot of people wrong and make their mark in their first season in the Principality Premiership.