Clermont Auvergne's medical staff had been tipping that Jones would make a stunning recovery from an ankle injury suffered against Biarritz last weekend. He was included in the initial squad of 24 named to play Stade Francais Paris on Saturday, but didn't make the final cut.
'It's a pity I couldn't play, because we've got an incredible crowd in, the weather's perfect and these are the sorts of games everyone wants to play,' Jones said. 'I believe I could have played, but there are still a few doubts about the ankle. The only wish you have when you're injured is to get back playing as quickly as possible.
'I really thought I would be fit for this game, but it's obviously going to take a few more days.'
A Clermont club spokesman said Jones's ankle would be looked at on Wednesday, in the hope of playing him against Castres next weekend. The delay in his return is another setback for Wales coach Ruddock, who is spending more time looking at X-rays than training videos these days.
World-class prop Gethin Jenkins (shoulder) and gifted centre Gavin Henson (groin) have already been ruled out of the autumn internationals. Scrum-half Dwayne Peel will have an ankle operation on Monday and will out of action for at least a fortnight, although understudy Gareth Cooper started on the bench for the Dragons on Saturday night.
Centre Tom Shanklin (knee) came through the Blues' loss to Wasps on Friday night unscathed, while Lions backrower Ryan Jones (shoulder) returns for the Ospreys against Bath on Sunday.
Ruddock's biggest problem next month could be at hooker. Robin McBryde has retired from rugby because of on-going neck problems, while possible replacements Rhys Thomas, Matthew Rees and Gareth Williams are all twiddling their thumbs on the injury list.
On the good-news front, Scarlets backrower Dafydd Jones (finger) is making a faster-than-expected recovery and may be available for the autumn Tests, and captain Gareth Thomas's sore shoulder is not considered a problem.
The Webb Ellis Cup visited Lampeter on Monday to recognise the fact that the town is celebrating a major milestone as it is believed the first ever game of rugby played in Wales, was in fact played in Lampeter 150 years ago.
Cardiff Blues U18 Girls will go into Sunday's Gemau Cymru with an extra spring in their step after Welsh internationals Elinor Snowsill and Philippa Tuttiett offered some last minute tips at a training session earlier this week.
Rob Howley and Josh Lewsey addressed more than 250 community club coaches and referees at the first WRU National Community Conference on the weekend. The volunteers benefitted from coaching masterclasses and workshops in a bid to connect all levels of the rugby pathway in Wales.
UEFA has today confirmed the Football Association of Wales (FAW) has been successful in its bid for the Millennium Stadium to host the 2017 UEFA Champions League Final on Saturday 3rd June, 2017 (kick-off: 19.45hrs GMT).